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I can't help you unless you tell me what's wrong.
The car should be in the garage unless someone's moved it.
Unless you come now, I'm going to leave without you.
Owen wouldn't eat anything unless he'd cooked it himself.
'Are you going to stay overnight?' 'Not unless it's absolutely necessary.'
This is the British English definition of unless. View American English definition of unless.
to kill someone in a violent way