make a clean breast of vs own up

make a clean breast of and own up both are verbs.

Word	Noun	Adjective	Verb	Adverb
make a clean breast of	No	No	Yes	No
own up	No	No	Yes	No

As verbs, make a clean breast of and own up are synonyms defined as:

make a clean breast of and own up: admit or acknowledge a wrongdoing or error

Other synonyms of make a clean breast of include fess up.

make a clean breast of (verb)	own up (verb)
admit or acknowledge a wrongdoing or error	admit or acknowledge a wrongdoing or error