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с кем имеешь дело

who you're dealing with

→ с
phrase Rare #32,165
who you're dealing with Used to refer to a person whose identity, abilities, or importance should be recognized. The phrase is commonly used as a warning or reminder; с кем is literally “with whom,” and иметь дело means “to deal with.”
RU: Не забывай, с кем имеешь дело.
EN: Don't forget who you're dealing with.

Я не уверен что ты представляешь, с кем имеешь дело.

I'm not sure you realize who you're dealing with.

— 1+1 (2011)

Ты должен знать, с кем имеешь дело.

You should know who you're dealing with.

— Рататуй (2007)

Ты, похоже, забыл, с кем имеешь дело.

You seem to have forgotten who you're dealing with.

Ты не представляешь, с кем имеешь дело.

You have no idea who you're dealing with.