American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Knock one’s block off


A warning that one is getting angered at you and will hit you in the head. A threat to physically hit with a hard blow to the head. ‘Block’ in this case refers to the head so to knock it off is to give you such a strong blow as to makeĀ  your head come off your neck. (Compare to Knock the living daylights out of.)

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