cotton up vs shine up

cotton up and shine up both are verbs.

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

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

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

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

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