cotton up vs play up

cotton up and play up both are verbs.

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

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

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

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

cotton up (verb)	play up (verb)
ingratiate oneself to; often with insincere behavior	move into the foreground to make more visible or prominent
	ingratiate oneself to; often with insincere behavior