back up vs choke off

back up and choke off both are verbs.

Word	Noun	Adjective	Verb	Adverb
back up	No	No	Yes	No
choke off	No	No	Yes	No

As verbs, back up and choke off are synonyms defined as:

Other synonyms of back up include choke, clog, clog up, congest, crap up, foul.

back up (verb)	choke off (verb)
establish as valid or genuine	suppress
become or cause to become obstructed	become or cause to become obstructed
make a copy of (a computer file) especially for storage in another place as a security copy
move backwards from a certain position
give moral or psychological support, aid, or courage to