American English

Definition of pin down phrasal verb from the Oxford Advanced American Dictionary

 

pin down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    pin somebodydown

     
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  1. 1to make someone unable to move by holding them firmly Two men pinned him down until the police arrived.
  2. 2to find someone and make them answer a question or tell you something you need to know I need the up-to-date sales figures but I can never pin him down at the office.

pin somebodydown (to something/doing something)

 
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to make someone make a decision or say clearly what they think or what they intend to do It's difficult to pin her down to fixing a date for a meeting.

pin somethingdown

 
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to explain or understand something exactly The cause of the disease is difficult to pin down precisely.
See the Oxford Advanced Learner's Dictionary entry: pin down