American English

Definition of fair-weather adjective from the Oxford Advanced American Dictionary

 

fair-weather

 adjective
adjective
 
[only before noun] (disapproving)
 
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(of people) behaving in a particular way or doing a particular activity only when it is pleasant for them a fair-weather friend (= someone who stops being a friend when you are in trouble)
See the Oxford Advanced Learner's Dictionary entry: fair-weather