Idiom Breakdown

knock someone's block off

SLANG

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Definition

To strike a person in the head, causing them to fall to the ground, especially in an unconscious condition; to beat up a person.

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""I can't stand the sight of him," he would say, "and I'd be glad if somebody would come along and knock his block off—when he was not in the ring.""
"An airport cab starter threatened to knock Fiorello H. LaGuardia's block off when the New York Mayor parked his car across the taxi line."
""If anyone wants to call a guardsman a draft dodger, tell him to stand in front of me and say it and I'll knock his block off," Gen. Fluck said."
"Mr. Gottfried said Miller announced, “I'm going to knock your block off”— and punched Mr. Jones, who was thrown against a buffet table."

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