[keep one's
shirt on] {v. phr.}, {slang} To calm down; keep fromlosing your temper or
getting impatient or excited.
Bob got veryangry when John accidentally bumped
into him, but John told him tokeep his shirt on.
- Usually used as a command;
may be consideredimpolite.
John said to Bob, "Keep your shirt on."
Contrast:
GETONE'S DANDER UP.
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