noun.
A buoyant device (frequently made of cork) attached to a line so as to suspend the end of the line with the hook (and bait or lure) above the bottom.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a small float usually made of cork; attached to a fishing line
Word Usage
"BOBBER RIG When you're fishing near a prominent obstruction, around the mouth of atributary, or over weeds, using a bobber is a good approach (you want it as small as possible to minimize the resistance when a pike takes the bait and runs)."