застыли

froze, became still

z ɐ s t ɨ lʲ ɪ → застыть

verb · plural · past indicative Rare #48,914

froze, became still Past tense, plural (perfective). Often used about people/animals becoming motionless, or liquids/paint/concrete solidifying.

RU: Мы застыли на месте от удивления.

EN: We froze in place from surprise.

Well, why are you frozen?

— Возвращение (2003)

We froze in fear.

Everyone froze somehow.

— Какой чудесный день (2012)

I think everyone was frozen in horror.

Sounds similar to