the calm before the storm

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

ketenangan sebelum badai

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.
Semua orang diam, tapi aku tahu itu hanya ketenangan sebelum badai.
The quiet morning was the calm before the storm of the busy workday.
Pagi yang tenang itu adalah ketenangan sebelum badai hari kerja yang sibuk.