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Verb pin down has 3 senses
pin down, peg down, nail down, narrow down, narrow, specify - define clearly; "I cannot narrow down the rules for this game"--1 is one way to determine
 Sample sentences:
 Somebody ----s something
 Somebody ----s something PP
 
pin down, pin up - attach with or as if with a pin; "pin up a picture"--2 is one way to attach
 Sample sentences:
 Somebody ----s somebody PP
 Somebody ----s something PP
 
pin down, narrow down - define clearly; "Can you pin down the difficulties"--3 is one way to focus, focalize, focalise, sharpen
 Sample sentences:
 Somebody ----s something
 Something ----s something
 
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