turn in vs hit the sack

turn in and hit the sack both are verbs.

Word	Noun	Adjective	Verb	Adverb
turn in	No	No	Yes	No
hit the sack	No	No	Yes	No

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

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

turn in (verb)	hit the sack (verb)
prepare for sleep	prepare for sleep
carry out (performances)
make an entrance by turning from a road
to surrender someone or something to another