dredge (Noun) — A power shovel to remove material from a channel or riverbed.
dredge (Verb) — (cooking) cover before cooking. ex. "dredge the chicken in flour before frying it"
dredge (Verb) — Search (as the bottom of a body of water) for something valuable or lost.
dredge (Verb) — Remove with a power shovel, usually from a bottom of a body of water.