(1)坚果(仁) (a fruit consisting of a single seed in a hard shell)[常用于复合词][C]：hazel～/wal～/chest～/ground～/pea～榛子/核桃/栗子/花生/花生;Brazil～s 巴西果;buy～s and raisins 买些果仁和葡萄干;〖同〗kernel，seed，stone，pit;

(2)螺母(帽) (a small round piece of metal with a hole through it， for screwing on the end of a bolt to hold pieces of wood，metal，etc together)[C]：He fixed the handle to the door with a～and bolt.他用螺母和螺栓将把手安在门上。

(3)(人的)脑袋(head)(sl)[C]：There was something wrong in his～. 他脑子有点不正常。That apple hit him on the～. 那个苹果砸在他的头上。

(4)小煤块(small lumps of coal)[pl];

(5)睾丸(sl，尤AmE)(testicles)[pl];

(6)傻(疯)子;怪人(sl，derog nutter)(slightly foolish，mad or eccentric person)[C]：She's a～— she wears the strangest clothes. 她是个疯子，总是身着最怪诞的服装。 If a guy always holds a book upside down to read it，he's considered some kind of a～. 要是有谁老是把书倒拿着看，他准被认为是个怪人。That～should be locked up. 这种神经病人应该关起来。〖同〗eccentric，madman，idiot;

(7)对……感兴趣的人，……迷(person very interested in sth;fan)[C](前面为一名词)：a football/camera/food/word/movie～足球/摄影/美食/词/电影迷;He's a～about model airplanes.他是个航模迷。〖同〗enthusiast，fanatic，zealot，fan;

do one's nut (Brit sl) 生气，气恼：The old man did his～over his daughter. 这老头对女儿大发雷霆。

for nuts/peanuts(Brit sl derog) 一点也(不);怎么也(不)[用于否定式]：He can't cook for～s.他压根就不会做饭。

a hard/tough nut(to crack)(infml) 1)难题，难处理的情况：This question is a hard～to crack.这是一个难题。2)难对付(劝说、影响)的人：Don't annoy him，he's a real tough～. 别惹他，这个人实在不好对付。

the nuts and bolts(infml) 基本细节：We should learn the～s and bolts of our profession. 我们应该学会我们这一行的基本知识。

off one's nut (sl) 精神不正常;发疯：He's simply gone off his～. 他简直发疯了。