ease off vs slacken off

ease off and slacken off both are verbs.

Word	Noun	Adjective	Verb	Adverb
ease off	No	No	Yes	No
slacken off	No	No	Yes	No

As verbs, ease off and slacken off are synonyms defined as:

Other synonyms of ease off include ease up, flag.

ease off (verb)	slacken off (verb)
become less intense	become less intense
reduce pressure or intensity