knock someone's block off

knock someone's block off

Beat up someone, as in If he doesn't leave at once, I'll knock his block off. This hyperbolic term employs block in the sense of "head," a usage dating from the 1600s. The idiom, however, dates only from about 1900. Also see beat the living daylights out of.
See also: block, knock, off

knock someone's block off

hit someone very hard in anger. informal
Block is used here in its informal sense of ‘head’.
See also: block, knock, off
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