This is the open, deep vowel you use when the doctor says “Say ahhh…” It’s the calming sound in “spa” and “father”, and the sound of “hot” in most American accents.
Pronounce the word/phrase:
Overall Score
The ‘Doctor’s Office’ Sound: Say Ahhh
To produce a perfect /ɑː/ sound, you need to create as much space in your mouth as possible. It’s an open sound that comes from the back of your throat. Don’t be shy!
A Tale of Two Accents: /ɑː/ in the US vs. UK
This sound is a key difference between American and British English. In American English, the /ɑː/ sound is common in short ‘o’ words. In British English, those same words often use a different, shorter sound (/ɒ/).
American English
The /ɑː/ sound is used in words like:
- hot
- stop
- rock
British English
These words use a short, rounded /ɒ/ sound.
- hot (RP)
- stop (RP)
- rock (RP)
However, both accents share the /ɑː/ sound in words like father and calm.
The Cot/Cut Trap: /ɑː/ vs /ʌ/
A common mix-up is between the open-back /ɑː/ and the central /ʌ/ (as in “cup”). The difference is how far you drop your jaw. For /ɑː/, your jaw is fully open. For /ʌ/, it’s in a neutral, mid position.
/ɑː/ (Wide Open)
Jaw Fully Dropped
cot/ʌ/ (Neutral)
Jaw Mid, Relaxed
cutThe “Hot Potato” Trick
Imagine you have a very hot potato in the back of your mouth. To avoid getting burned, you’d instinctively drop your jaw and pull your tongue down and back. That exact position is what you need to create the perfect /ɑː/ sound!