pin down vs peg down

pin down and peg down both are verbs.

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

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

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

pin down (verb)	peg down (verb)
define clearly	define clearly
attach with or as if with a pin	fasten or secure with a wooden pin
place in a confining or embarrassing position