dredge up

verb

1. To find by diligently searching, especially from unsavory sources.

   “Where did you dredge up the idea that they didn't know what hospital he was born in?”

2. Used other than figuratively or idiomatically: see dredge, up.

   “Young, dense seed mussels are dredged up and relaid in more sheltered areas, where they will not be destroyed by storms.”

   “The rush to dredge resulted in engineering problems, with those who had not first ascertained the depth of the wash by boring later dredging up only buckets of water.”