pin down
  1. To attach or secure with pins.
    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, professional wrestling) To hold the opponent back-first so both his or her shoulders touch the mat.
  4. (idiomatic) To corner somebody in order to get a firm answer.
    Let's try to pin him down on a price.

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