take back vs unsay

take back and unsay both are verbs.

Word	Noun	Adjective	Verb	Adverb
take back	No	No	Yes	No
unsay	No	No	Yes	No

As verbs, take back and unsay are synonyms defined as:

Other synonyms of take back include swallow, withdraw.

take back (verb)	unsay (verb)
cause someone to remember the past	take back what one has said
take back what one has said
move text to the previous line; in printing
bring back to the point of departure
regain possession of something
resume a relationship with someone after an interruption, as in a wife taking back her husband