1.
If someone dredges up a piece of information they learned a long time ago, or if they ~ a distant memory, they manage to remember it.
...an American trying to ~ some French or German learned in high school...
PHRASAL VERB: V P n (not pron)
2.
If someone dredges up a damaging or upsetting fact about your past, they remind you of it or tell other people about it.
I wouldn’t want to ~ the past...
It’s the media who keep dredging it up.
PHRASAL VERB: V P n (not pron), V n P