This is a skill we don’t practice enough.
Suppose you forget the Russian word for restaurant.
Instead of completely stopping the conversation, try describing what you mean with words you already know.
Maybe you remember:
еда — yee-DÁ — food
есть — yest’ — to eat
место — MYES-ta — place
You might not create a beautiful sentence.
That’s okay.
Use what you’ve got.
Native speakers do versions of this too when they can’t remember a specific word.
Conversation isn’t a vocabulary test.
The goal is to communicate.