beat the pants off someone

beat the pants off someone

or

beat someone's pants off

INFORMAL
If you beat the pants off someone or if you beat their pants off, you defeat them completely in a contest or competition. He brought out a chess board. `Now, Smith, I'm going to beat your pants off'. The non-academic children usually beat the pants off the rest at sport and technical work.
See also: beat, off, pant
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