What does 'nice one' mean in British English?

What it means: "Well done" or "good job" — a casual expression of approval or congratulation.

"I got the promotion." "Nice one!"
"Fixed the bug in an hour." "Nice one, mate."

The tone: Warm and informal. It signals genuine appreciation without making a big deal of it. It's the working-class British equivalent of "well done" — less formal, more authentic.

Sarcastic use: Context can flip the meaning entirely. Said with the right tone, "nice one" means "that was a stupid thing to do" or "thanks a lot (not)."

"I left my phone on the train." "Nice one." = That was a bad move.

The sarcastic version is always clear from tone — usually flatter or more drawn out. Written without context, it's usually genuine.

Register: Casual British English. Very natural among friends and colleagues. Rare in formal settings.

Tags: British English, praise, sarcasm, informal