cozy up vs cotton up

cozy up and cotton up both are verbs.

Word	Noun	Adjective	Verb	Adverb
cozy up	No	No	Yes	No
cotton up	No	No	Yes	No

As verbs, cozy up and cotton up are synonyms defined as:

cozy up and cotton up: ingratiate oneself to; often with insincere behavior

Other synonyms of cozy up include play up, shine up, sidle up, suck up.

cozy up (verb)	cotton up (verb)
ingratiate oneself to; often with insincere behavior	ingratiate oneself to; often with insincere behavior