• n. 螺母，螺帽；坚果；难对付的人，难解的问题
• vi. 采坚果
• n. (Nut)人名；(阿拉伯)努特；(柬)努

来自拉丁语nux,坚果，果仁，词源同nuclear,nucleus.俚语义睾丸，头，疯子。

nut

nut: [OE] Nut is a member of a restricted family of Indo-European ‘nut’-words, present only in the Germanic, Romance, and Celtic languages, that were derived ultimately from the Indo-European base *knu-, denoting ‘lump’. Latin nux (source of French noix, Italian noce, and Spanish nuez) came from an extended base *knuk-. Its derivative nucleus ‘nut, kernel’ has given English nucleus [18] and nuclear [19], and Vulgar Latin *nucātum is the source of English nougat [19].

The Germanic branch of the family, on the other hand, comes from an extended base *knut-, which has produced German nuss, Dutch noot, Swedish nöt, Danish nød, and English nut. The adjectival use of the plural, nuts, for ‘crazy’ dates back to the mid-19th century. It came from the metaphorical application of nut to ‘head’ – hence off one’s nut ‘deranged’, and in due course nuts.
=> nougat, nuclear, nucleus

nut (n.)

"hard seed," Old English hnutu, from Proto-Germanic *hnut- (cognates: Old Norse hnot, Dutch noot, Old High German hnuz, German Nuss "nut"), from PIE *kneu- "nut" (cognates: Latin nux; see nucleus). Sense of "testicle" is attested from 1915. Nut-brown is from c. 1300 of animals; c. 1500 of complexions of women.

Meaning "crazy person, crank" is attested from 1903 (British form nutter first attested 1958; nut-case is from 1959); see nuts. American English slang sense of "amount of money required for something" is first recorded 1912. The nut that goes onto a bolt is first recorded 1610s (used of other small mechanical pieces since early 15c.). Nuts and bolts "fundamentals" is from 1960.

1. The Daily Express describes Dr Carey as a pretty tough nut.

《每日快报》把凯里医生说成是特别难对付的家伙。

来自柯林斯例句

2. Getting out there is in many ways the hardest nut to crack.

从很多方面来说，出去交际是最难以做到的事了。

来自柯林斯例句

3. There's some nut out there with a gun.

外边有个拿着枪的疯子。

来自柯林斯例句

4. We heard your sister doing her nut.

我们听到你妹妹在大发脾气。

来自柯林斯例句

5. It is a tough nut for him to crack.

这对他而言是一个难题.

来自《简明英汉词典》