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keep (one's) shirt on - 1 dictionary result
shirt   (shûrt)   
n.  
  1. A garment for the upper part of the body, typically having a collar, sleeves, and a front opening.
  2. An undershirt.
  3. A nightshirt.

[Middle English shirte, from Old English scyrte, short garment; see sker-1 in Indo-European roots.]
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