noun
plural nuts
[count] a small dry fruit with a hard shell that grows on trees, bushes, etc.
see picture on next page
the inside part of a nut that is used as food
[count] :a piece of metal that has a hole through it so that it can be screwed onto a bolt or screw - see picture at carpentry; see also lug nut, wing nut
[count] informal
a crazy or strange person
a person who is very interested in or enthusiastic about something
nuts [plural] informal + impolite :a man's testicles
a hard/tough nut (to crack)
a person or thing that is difficult to deal with, understand, or influence
nuts and bolts
the basic parts or details of an activity, job, etc.
soup to nuts
US