A peaceful time before trouble or chaos starts.
Спокойное время перед началом неприятностей или хаоса. (spokoynoye vremya pered nachalom nepriyatnostey ili khaosa)
"The office is quiet now, but it’s just the calm before the storm."
"Сейчас в офисе тихо, но это лишь затишье перед бурей." (seychas v ofise tikho no eto lish zatishye pered burey)
To have a secret plan or idea.
to trust someone enough to tell them secrets
to easily understand someone's thoughts and intentions
to solve small problems or differences
to organize oneself or one's actions effectively
until the very last moment; close to the deadline