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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 pin down
 弄清楚

From: WordNet (r) 2.0

 pin down
      v 1: define clearly; "I cannot narrow down the rules for this
           game" [syn: peg down, nail down, narrow down, narrow,
            specify]
      2: attach with or as if with a pin; "pin up a picture" [syn: pin
          up]
      3: define clearly; "Can you pin down the difficulties" [syn: narrow
          down]