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Why "castle" sounds different in British English
RP says /ˈkɑːsl̩/, with the long /ɑː/ of "father". American English says /ˈkæsl̩/. In both accents the T is silent, just as it is in "whistle", "fasten" and "listen".
The small mark under the L means it forms a syllable on its own: the tongue moves straight from S to L without a full vowel in between. In British English this final L is "dark", made with the back of the tongue raised. Regional variation is clear here: in the North, "castle" usually has a short a, and in Newcastle the local pronunciation of the city's own name uses a short a too.
How to say "castle" like a Brit, step by step
- Start with k and open straight into a long ah.
- Add a clean s. Leave out the T completely.
- Go from S to a dark l with the back of the tongue raised and almost no vowel: s'l.
- Stress the first syllable: KAH-s'l.
Practise "castle" in a sentence
- We visited Edinburgh Castle on our first day.
- The children built a sandcastle on the beach.
- The castle ruins are open to the public in summer.
Saying it once correctly is easy. Saying it right in the middle of a fast sentence is the hard part, which is why the sentences above matter more than the single word.
Frequently asked questions
How do you pronounce castle in a British accent?
In Received Pronunciation, castle is pronounced /ˈkɑːsl̩/, roughly "KAH-suhl". The T is silent, the vowel is a long "ah", and the ending is a syllabic L.
Is the American pronunciation of castle wrong?
No. /ˈkæsl̩/ is standard in American English. Both are correct, they simply belong to different accents. If you are learning a British accent, aim for /ˈkɑːsl̩/.