pin down

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pin down (third-person singular simple present pins down, present participle pinning down, simple past and past participle pinned down) (transitive)

1. To attach or secure with pins.

   Coordinate terms: pin up, tack up

   Pin down the tablecloth, so it doesn't blow away in the breeze.

2. (idiomatic) To identify something (e.g. a decision or plan) clearly or specifically.

   Something is wrong, but I can't pin it down.

3. (wrestling) To hold the opponent back-first so both his or her shoulders touch the mat or ground.

   Synonym: pin

4. (idiomatic) To corner somebody in order to get a firm answer.

   Let's try to pin him down on a price.

• nail down