nut

/nʌt/
verb
  1. To hit someone's head with one's own head (informal, often used in sports).
    • The soccer player accidentally nutted the opponent during a header.
    • He was sent off for nutting the referee.
    • In the fight, one guy nutted the other right in the face.
noun
  1. A dry fruit with a hard shell that contains a seed that can be eaten.
    • She cracked open a walnut and ate the nut inside.
    • The squirrel buried a nut in the garden for winter.
    • Nuts like almonds and cashews are healthy snacks.
  2. A small piece of metal with a hole through it that screws onto a bolt to hold things together.
    • He tightened the nut with a wrench to secure the shelf.
    • She bought a pack of nuts and bolts from the hardware store.
    • The bicycle wheel came loose because the nut had fallen off.
  3. A person who is very enthusiastic about something or acts in a strange or crazy way (informal).
    • She's a history nut and can name every U.S. president in order.
    • Don't listen to him — he's a nut who believes in conspiracy theories.
    • My uncle is a total fitness nut who goes to the gym every day.