silt up vs choke off

silt up and choke off both are verbs.

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

As verbs, choke off is a hypernym of silt up; that is, choke off is a word with a broader meaning than silt up:

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

silt up (verb)	choke off (verb)
become chocked with silt	suppress
	become or cause to become obstructed