shine up vs cotton up

shine up and cotton up both are verbs.

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

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

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

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

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