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beats me

This baffles or puzzles me, as in I don't know how he does it—beats me! This term originally may have alluded to a winning poker hand. It may also be related to the even earlier usage of beat for “astonished” or “at a loss.” [Slang; mid-1800s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for beats me

unimaginable, unintelligible, puzzling, impenetrable, opaque, unfathomable, baffling, mystifying, inconceivable, cryptic, enigmatic, inscrutable, mysterious, obscure, perplexing, sibylline, unclear, Delphic, Greek, fathomless