Dictionary & Thesaurus

pin down

1.	(verb) define clearly; "Can you pin down the difficulties"
	Synonyms: narrow down
	Related Words: focus, sharpen

2.	(verb) define clearly; "I cannot narrow down the rules for this game"
	Synonyms: nail down, narrow, narrow down, peg down, specify
	Related Words: concretize, determine

3.	(verb) attach with or as if with a pin
	Synonyms: pin, pin up
	Related Words: attach