chicken out
US /ˈtʃɪk.ɪn aʊt/
UK /ˈtʃɪk.ɪn aʊt/

1.
겁먹다, 쫄다, 포기하다
to decide not to do something because you are too frightened
:
•
I was going to try bungee jumping, but I chickened out at the last minute.
번지 점프를 하려고 했는데, 마지막 순간에 겁이 나서 포기했어.
•
He was going to ask her out, but he chickened out.
그는 그녀에게 데이트 신청을 하려 했지만, 겁이 나서 포기했어.