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

1.
當頭一棒, 沉重打擊, 背叛
an act of betrayal or a severe disappointment
:
•
Losing the promotion after all that hard work was a kick in the teeth.
辛辛苦苦工作後失去晉升機會,真是當頭一棒。
•
His sudden resignation was a kick in the teeth for the whole team.
他突然辭職對整個團隊來說是一個沉重打擊。