ничего не делали

did nothing

→ ничто
phrase Rare #43,699
did nothing Past-tense form used with a plural subject or polite/formal singular вы. Depending on context, it can mean “didn’t do anything” or refer to nothing being done to someone.
RU: Мы ничего не делали, только ждали автобуса.
EN: We didn’t do anything; we just waited for the bus.

Мы ничего не делали!

We did nothing!

— Эксперимент (2001)

С ним ничего не делали?

Didn't they do anything to him?

— Ребекка (1940)