bring up vs dredge up

bring up and dredge up both are verbs.

Word	Noun	Adjective	Verb	Adverb
bring up	No	No	Yes	No
dredge up	No	No	Yes	No

As verbs, dredge up is a hyponym of bring up; that is, dredge up is a word with a more specific, narrower meaning than bring up:

bring up (verb)	dredge up (verb)
cause to load (an operating system) and start the initial processes	mention something unpleasant from the past
make reference to
put forward for consideration or discussion
summon into action or bring into existence, often as if by magic
raise from a lower to a higher position
cause to come to a sudden stop
look after a child until it is an adult
promote from a lower position or rank