Definition

1. Verb (transitive):
   • To attach or fasten something securely, often with a pin or similar object: This meaning refers to physically securing an item in place.
   • To force someone into a specific, often difficult or confining, position or situation: This figurative meaning describes restricting someone's options or freedom.
   • To define, identify, or specify something clearly and precisely: This meaning involves determining the exact nature or details of something abstract.

Examples of Usage

• Verb:
  • She used a thumbtack to pin down the poster on the bulletin board. (Physical attachment)
  • The reporter's sharp questions finally pinned down the politician on the issue. (Forcing into a specific position/answer)
  • We need to pin down the exact cause of the problem before we can fix it. (Defining clearly)
  • The heavy snowfall pinned down the travelers in the mountain cabin. (Confining in a place)

Advanced Usage

• "to pin someone down to a time/place/decision": to get someone to commit to a specific detail.
  • I'm trying to pin him down to a meeting time, but his schedule is so busy.
• Used in military contexts to describe suppressing enemy forces with fire, preventing their movement.
  • The machine gun fire pinned down the enemy squad.

Variants and Related Words

• Pinpoint (verb): To locate or identify with very great precision. (e.g., )
• Nail down (verb, phrasal): A close synonym meaning to establish or finalize something definitively. (e.g., )

Synonyms

• Fasten (for physical attachment).
• Trap, Corner (for forcing into a position).
• Determine, Specify, Identify, Define (for specifying clearly).

Related Phrasal Verbs

• Pin on (someone): To assign blame or responsibility to someone.
  • They tried to pin the crime on an innocent man.
• Pin up: To attach something to a vertical surface.
  • He pinned up the schedule on the office door.

Related Idioms

• Pin your hopes on (someone/something): To rely completely on someone or something for success.
  • The team is pinning its hopes on the new star player.
• Pin money: A small amount of extra money for personal expenses.
  • She babysits to earn a little pin money.

Verb

1. attach with or as if with a pin
   • pin up a picture
2. place in a confining or embarrassing position
   • He was trapped in a difficult situation
3. define clearly
   • I cannot narrow down the rules for this game