the calm before the storm

US /ðə kɑːm bɪˈfɔːr ðə stɔːrm/
UK /ðə kɑːm bɪˈfɔːr ðə stɔːrm/
"the calm before the storm" picture
1.

폭풍 전의 고요함

a period of unusual quiet or inactivity before a period of great activity, excitement, or trouble

:
Everyone was quiet, but I knew it was just the calm before the storm.
모두 조용했지만, 나는 그것이 단지 폭풍 전의 고요함이라는 것을 알았다.
The quiet morning was the calm before the storm of the busy workday.
조용한 아침은 바쁜 업무일의 폭풍 전 고요함이었다.