keep shirt on
keep one's shirt onand keep one's pants on
Fig. to be patient. Wait a minute! Keep your shirt on! Keep your pants on! I'll be with you in a minute.
keep your shirt on
to stay calm The meeting may be pretty unpleasant, so promise me you'll keep your shirt on.Related vocabulary: keep your cool
keep (one's) shirt onSlang
To remain calm or patient: The plane doesn't land for another hour, so keep your shirt on.