mouth off vs rabbit on

mouth off and rabbit on both are verbs.

Word	Noun	Adjective	Verb	Adverb
mouth off	No	No	Yes	No
rabbit on	No	No	Yes	No

As verbs, mouth off and rabbit on are synonyms defined as:

mouth off and rabbit on: talk in a noisy, excited, or declamatory manner

Other synonyms of mouth off include jabber, rant, rave, spout.

mouth off (verb)	rabbit on (verb)
talk in a noisy, excited, or declamatory manner	talk in a noisy, excited, or declamatory manner