Her legs gave out and she collapsed.

她腿一软倒了下去。

《牛津词典》

One afternoon, while attempting to get into bed she collapsed from what was eventually discovered to be a heart attack.

一天下午，当她试图上床时，她摔倒了，最终查明是因为心脏病发作。

youdao

She said, weeping, before she collapsed to the floor.

她边哭边说道，最后昏倒在地上。

youdao

(Speech) She says some suffer from head injuries,broken bones , internal bleeding and collapsed lungs.

VOA: standard.2009.11.27

She collapsed in her cell, bleeding, and survived only because a prison guard discovered her.

NEWYORKER: A Loaded Gun

She collapsed after men posing as water board officials searched her home on 17 August.

BBC: Hester Mottershead death: Men charged over burglary

As she waited for Jemsek to treat her latest infection, she collapsed on the floor, vomiting.

FORBES: Lyme Inc.