a kick in the teeth
US /ə kɪk ɪn ðə tiːθ/
UK /ə kɪk ɪn ðə tiːθ/

1.
큰 실망, 배신감, 좌절
an act of betrayal or a severe disappointment
:
•
Losing the promotion after all that hard work was a kick in the teeth.
그렇게 열심히 일했는데 승진을 놓친 것은 큰 실망이었다.
•
His sudden resignation was a kick in the teeth for the whole team.
그의 갑작스러운 사임은 팀 전체에게 큰 실망이었다.