pin down

Verb
  1. Define clearly (synset 200717446)
    "I cannot narrow down the rules for this game"
    is a type of: determine - fix in scope; fix the boundaries of
    subtypes: concretize - make something concrete
    same as: nail down, narrow, narrow down, peg down, specify
  2. Place in a confining or embarrassing position (synset 202501834)
    "He was trapped in a difficult situation"
    is a type of: confine, detain - deprive of freedom; take into confinement
    same as: trap
  3. Attach with or as if with a pin (synset 201342831)
    "pin up a picture"
    is a type of: attach - cause to be attached
    same as: pin up

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