Etymology

misbehave

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Today it means: To act or behave in an inappropriate, improper, incorrect, or unexpected manner. Full definition →

Middle English misbehaven
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The story

  1. Middle English · inherited frommisbehaven
  2. English todaymisbehave

From Middle English misbehaven, equivalent to mis- + behave.

Etymology from Wiktionary, CC BY-SA 4.0.