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Verb: pin down  pin dawn
  1. Define clearly
    "I cannot pin down the rules for this game";
    - peg down, nail down, narrow down, narrow, specify
  2. Place in a confining or embarrassing position
    "He was pinned down in a difficult situation";
    - trap
  3. Attach with or as if with a pin
    "pin down a picture";
    - pin up

Derived forms: pins down, pinning down, pinned down

Type of: attach, confine, detain, determine