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встала на

stood on; took (someone’s) side

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phrase Common #8,236
stood on; took (someone’s) side Used with a feminine subject. In the expression «встать на сторону», it means to take someone’s side.
RU: Она встала на сторону брата.
EN: She took her brother’s side.

Она встала на его сторону.

She took his side.

Что, встала на ножки, значит?

Oh, so you’re up on your feet now?

— Ice (2018)