Her arms hung slackly by her sides.

她的胳膊在两边耷拉着。

《牛津词典》

There's my boat, John, with her sides stove in!

那是我的船，约翰，船的侧面都陷下去了！

youdao

She lay on her back, with arms stretched in utter weakness by her sides.

她仰面躺着，两只手臂完全无力地摆在身旁。

youdao

Becky Marie Thane lets her long arms fall to her sides in surrender, the blue bandanna dangling from her right hand.

NEWYORKER: Indianapolis (Highway 74)

Rules for the game are few and simple: the subject must be lying straight, with palms against his or her sides and toes pointing towards the ground.

FORBES: A disturbing Facebook meme: The lying down game

She pressed them to her sides.

NEWYORKER: Brooklyn Circle