stiff upper lip
I've already checked some dictionaries but can't get it clearly.
Is this expression only for bad luck?
I think I heard someone said he had to keep a stiff upper lip when he really wanted to laugh in a serious meeting.
Would you use this when you hold your laughter?
Re: stiff upper lip
Not really. The expression "keep a straight face" would be more appropriate. Here are some other 'restraint' idioms/collocations:
Originally Posted by sumo
sit on one's hands [i.e. don't applaud] - show no approval
bite one's tongue - not say something that one really wants to say
stifle a yawn/giggle/sneeze - not show boredom/laughter/sneeze
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