How to Pronounce the OH Sound in Australian English
If you've ever said a word like go, home, or coat and noticed a flicker of confusion on the other person's face, the OH sound might be the reason. At Aussie English with Amanda, this is one of the most requested topics from students learning Australian pronunciation, and for good reason. It's a sound that exists in English but not in a lot of other languages, which means a lot of learners are saying something close, but not quite right, without realising it.
What Is the OH Sound in Australian English?
The OH sound is a vowel sound found in words like no, go, coat, show, and toe. In phonetics, it's classed as a diphthong, which means it's made up of two vowel sounds that glide together rather than one steady sound. In the Mitchell-Delbridge system used for Australian English, the system behind the Macquarie Dictionary, this sound is written as /oʊ/. You may also see it written as /əʉ/, or as /əʊ/ in British English resources and /oʊ/ in American and Canadian English resources. These different symbols all describe the same family of sound, just notated slightly differently depending on the reference system.
The OH sound also has several different spellings in written English. It appears as a single O (go, no), as OA (coat, road), as OW (show, blow), and as OE (toe). Different spelling, same sound.
Key Features of the OH Sound
As a diphthong, the OH sound is made up of two distinct mouth movements rather than one fixed shape. It starts close to a short O sound, the one in hot, with the mouth open, lips rounded, and tongue low. It then glides into an EW sound, the same vowel at the end of true or blue, with the tongue moving forward toward the roof of the mouth and the lips flattening. That glide, the movement from one shape to the other, is what defines the sound. A flat, unmoving vowel in its place is a sign the sound isn't being produced correctly.
Where the OH Sound Is Used
This sound appears constantly in everyday Australian English, in both formal and casual speech. Common words include go, no, home, show, coat, road, slow, photo, and toe. It turns up in casual conversation just as often as in formal contexts, which is part of why mispronouncing it can have a real impact on how clearly a person is understood day to day.
Why the OH Sound Matters for Clear Communication
Many learners substitute the OH sound with one of two other real English vowels, a short O as in hot or a long AW as in caught. Both are valid sounds in English, but neither is the OH sound, and the substitution can create genuine confusion for an Australian listener, particularly without enough context to fill in the gap. For professionals working in Australian workplaces, this kind of small but consistent vowel substitution can affect how easily colleagues, clients, or interviewers understand them, even when their vocabulary and grammar are strong.
How to Pronounce the OH Sound Step by Step
Step one. Start with the short O sound, the same one in hot. Open the mouth, round the lips, and keep the tongue low.
Step two. Slide into an EW sound, the same vowel at the end of true or blue. Keep the tip of the tongue low behind the bottom teeth while the back of the tongue moves forward, and keep the lips flat.
Step three. Bring the two sounds together, short O then EW. A good word to practise this on is goat. Break it apart into its three parts, g, oh, and t, and isolate the OH sound in the middle.
Common Mistakes to Avoid
The most common mistake is producing a flat, unmoved vowel instead of a true glide. If the mouth doesn't move between the two shapes, the sound won't land as a genuine OH sound, even if the starting position is close.
The second common mistake is full substitution, replacing the OH sound entirely with a short O as in hot or a long AW as in caught. Both of these are real English vowels, but using them instead of the OH sound changes the word and can confuse the listener.
It's also worth noting that the Australian version of this sound is more centralised than the American version, with flatter lips, while the American version tends to be more rounded. Producing something closer to the American version isn't a major problem, as long as the mouth is genuinely moving through the glide. The real goal is the movement, not a perfectly rounded Australian accent.
How to Train Your Ear With Minimal Pairs
One of the most effective ways to hear this sound clearly is to listen for minimal pairs, two words that sound almost identical except for this one vowel. Pairs like not and note, hop and hope, on and own, and cost and coast contrast the OH sound with the short O sound. The OH words have a clear glide, while the short O words are flat and quick.
A second set of minimal pairs contrasts the OH sound with the AW sound, as in caught. Pairs like so and saw, boat and bought, show and shore, and coat and caught highlight the difference. The AW sound is long and held at the back of the mouth, while the OH sound moves.
Practising with minimal pairs trains the ear before it trains the mouth, which makes the physical technique easier to apply once it's time to start speaking the sound out loud.
Frequently Asked Questions
Is the Australian OH sound the same as the American or British OH sound?
They belong to the same sound family, but the exact mouth shape differs slightly. The Australian version is more centralised with flatter lips, the American version is typically more rounded, and the British version sits somewhere between the two depending on the speaker. The written IPA symbols can also differ between systems even when they're describing a closely related sound.
What is the IPA symbol for the OH sound in Australian English?
In the Mitchell-Delbridge system used for Australian English, including in the Macquarie Dictionary, the symbol is /oʊ/. Other systems may use /əʉ/ or /əʊ/ for closely related versions of the same sound family.
Why do some words spelt completely differently use the same OH sound?
English spelling doesn't always match pronunciation. The OH sound can be written as O (go), OA (coat), OW (show), or OE (toe), among other patterns, which is one of the reasons this sound is confusing for learners relying on spelling to predict pronunciation.
How long does it usually take to fix a single vowel sound like this?
It depends on the learner, but with focused practice using minimal pairs and shadowing real conversation, most people start to notice a difference within a few weeks of consistent practice. Lasting change comes from repetition in real speech, not just isolated drills.
Key takeaways
• The OH sound is a diphthong, /oʊ/ in the Mitchell-Delbridge system used for Australian English, made up of two gliding mouth movements rather than one fixed shape.
• It can be spelt as O, OA, OW, or OE, which is why relying on spelling alone makes it hard to predict.
• Many learners substitute it with a short O (hot) or a long AW (caught), both real English sounds but not this one.
• The Australian version is more centralised with flatter lips than the rounder American version.
• Minimal pairs like not/note and boat/bought are an effective way to train the ear before training the mouth.
• Consistent practice with real conversation, not just isolated drills, is what makes the change stick.
If you want more structured support to keep working on sounds like this one, Aussie English with Amanda runs a six month coaching program called The Australian Pronunciation Studio. Doors aren't always open, so head to the link to find out what's inside and when the next round opens.
