长肉

gain weight

→ 长
phrase Rare #29,879
gain weight Literally means “grow flesh”; it can refer to gaining body weight, including muscle.
CH: 最近我吃得多了,开始长肉了。
EN: I've been eating more lately and have started gaining weight.

好吧,我的确在长肉,不过长的全是肌肉。

Okay, I am putting on weight, but it's all muscle.

她认定我工作太辛苦了,所以才没长肉。

She’s convinced that I’m not putting on weight because I work too hard.

要多吃一点你才会长肉

You need to eat more if you want to gain weight.

— 亚特兰蒂斯:失落的帝国 (2001)

不长肉也不长脑子

You don’t gain weight, and you don’t gain brains either.

— 真爱至上 (2003)