hit the sack vs retire

hit the sack and retire both are verbs.

Word	Noun	Adjective	Verb	Adverb
hit the sack	No	No	Yes	No
retire	No	No	Yes	No

As verbs, hit the sack and retire are synonyms defined as:

Other synonyms of hit the sack include bed, crawl in, go to bed, go to sleep, hit the hay, kip down, sack out, turn in.

hit the sack (verb)	retire (verb)
prepare for sleep	prepare for sleep
	cause to get out
	cause to be out on a fielding play
	lose interest
	pull back or move away or backward
	dispose of (something no longer useful or needed)
	break from a meeting or gathering
	go into retirement; stop performing one's work or withdraw from one's position
	withdraw from active participation
	make (someone) retire
	withdraw from circulation or from the market, as of bills, shares, and bonds