Something outstanding or impressive, or a person who hits hard or sings loudly, especially British slang for something excellent.
From 'belt' (to hit or strike forcefully) plus '-er' (agent suffix). In British slang, it evolved to mean something impressive or great, possibly influenced by expressions like 'hit out of the park.'
British slang is full of words that come from violent actions but mean something good—'belter,' 'corker,' 'cracker'—like the harder you do something, the more impressive it becomes! It reveals something about British humor.
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