Noun mix up has 1 sense
  1. confusion, mix-up - a mistake that results from taking one thing to be another; "he changed his name in order to avoid confusion with the notorious outlaw"
    --1 is a kind of mistake, error, fault
,Verb mix up has 2 senses
  1. jumble, confuse, mix up - assemble without order or sense; "She jumbles the words when she is supposed to write a sentence"
    --1 is one way to assemble, piece, put together, set up, tack, tack together
    Sample sentence:
    Somebody ----s something
  2. stump, mix up - cause to be perplexed or confounded; "This problem stumped her"
    --2 is one way to perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, gravel, amaze, dumbfound
    Sample sentence:
    The performance is likely to mix up Sue
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