narrow down vs peg down

narrow down and peg down both are verbs.

Word	Noun	Adjective	Verb	Adverb
narrow down	No	No	Yes	No
peg down	No	No	Yes	No

As verbs, narrow down and peg down are synonyms defined as:

Other synonyms of narrow down include nail down, narrow, pin down, specify.

narrow down (verb)	peg down (verb)
become more focused on an area of activity or field of study	define clearly
define clearly	fasten or secure with a wooden pin