ease up vs slacken off

ease up and slacken off both are verbs.

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

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

Other synonyms of ease up include ease off, flag.

ease up (verb)	slacken off (verb)
become less intense	become less intense
reduce pressure or intensity
move in order to make room for someone for something