B2 [ C ] the dry fruit of particular trees that grows in a hard shell and can often be eaten:

[ C ] a small piece of metal with a hole in it through which you put a bolt:

[ C ] informal or offensive a person who behaves in a very silly, stupid, or strange way or an offensive term for a person who is mentally ill:

[ C ] informal someone who is extremely enthusiastic about a particular activity or thing:

[ C ] UK slang a person's head:

[ U ] US informal the amount of money necessary to operate a business or cover your costs:

to hit someone or something with your head: