fair-weather friend
US /ˈferˌweð.ər ˈfrend/
UK /ˈferˌweð.ər ˈfrend/

1.
좋을 때만 친구, 겉치레 친구
a person who is only a friend when things are going well and abandons you when difficulties arise
:
•
I thought he was my friend, but he turned out to be a fair-weather friend when I lost my job.
그가 내 친구인 줄 알았는데, 내가 직장을 잃었을 때 그는 좋을 때만 친구였다.
•
Don't rely on him; he's just a fair-weather friend.
그를 믿지 마; 그는 그저 좋을 때만 친구야.