瘦身的英文：
slimming, lose weight, weight reducing

参考例句：

She'd undergone 13 operations, including a tummy tuck.
她已经做了 13 次手术，包括一次腹部瘦身整形手术。

slimming是什么意思：
adj. 苗条的；渺茫的；微薄的
v. 使体重减轻，减肥

She is trying to slim.
她正在设法减肥。

Their chance of winning are slim.
他们取胜的机会很渺茫。

Mary was slim, gamine, businesslike
玛丽身材苗条，姿色艳丽，办事有条理。

lose是什么意思：
v. 遗失；输掉；浪费；被...夺去；不明白；逃避；错过

to lose; to miss; to disappear; to mislay
遗失

A tale never loses in the telling.
故事总是被人们说得添枝加叶的。

Merry is he that has nought to lose
人无所失,不亦乐乎

weight是什么意思：
n. 重量；砝码，秤砣；重物；负担；重要性；严重性
v. 使…变重；偏袒

The weight put on this thread was a weight of two pounds.
放在这条绳子上的重物为两磅。

We need a hanging weight.
我们需要一个悬挂着的重物。

Pull one's weight
竭尽全力