Definition of pin down phrasal verb from the Oxford Advanced Learner's Dictionary

 

pin down

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to make somebody unable to move by holding them firmly Two men pinned him down until the police arrived.
  2. 2to find somebody 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 down somebody

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pin down somebody to doing something

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pin down somebody to something

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pin somebody down

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pin somebody down to doing something

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pin somebody down to something

 
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to make somebody 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.
to explain or understand something exactly The cause of the disease is difficult to pin down precisely.
See the Oxford Advanced American Dictionary entry: pin down