瘦的英文翻译可以是：thin、lean、emaciated等
thin
英[θɪn] 美[θɪn]
adj. 薄的; 瘦的; 细的; 稀少的;
vt. 使瘦; 使淡; 使稀疏;
vi. 变薄; 变瘦; 变淡;
[例句]He was looking pale and thin.
他面黄肌瘦。
比较级：thinner 最高级：thinnest 第三人称单数：thins 现在分词：thinning 过去式：thinned 过去分词：thinned
lean
英[li:n] 美[lin]
vt. （使） 倾斜，屈身;
vt. 倚; 依赖; 使斜靠; 使变瘦;
adj. 瘦的; 贫瘠的; 简洁的; 精干的;
[例句]It is a beautiful meat, very lean and tender.
这块肉很好，又瘦又嫩。
比较级：leaner 最高级：leanest 第三人称单数：leans 现在分词：leaning 过去式：leant 过去分词：leant
瘦 thin; lean; emaciated; tight; poor
1.（脂肪少; 肉少） thin; emaciated:
脸瘦 be thin in the face;
面黄肌瘦 be sallow and emaciated;
瘦得皮包骨头 be only skin and bones;
自去年以来她瘦了好多。She has thinned down a lot since last year.
2（食用的肉脂肪少） lean: 瘦肉 lean meat
3.（窄小） tight:
这件上衣腰身瘦了点。The coat is a bit tight at the waist.
这双鞋我穿太瘦了。These shoes are too tight for me.
4.（地力薄; 不肥沃） not fertile; poor:
瘦土薄田 poor soil and barren land