Wiktionary
treble hook
n. (context fishing English) A fishhook where three hooks share a single shank, each point separated by 120º.
Usage examples of "treble hook".
One point of the treble hook had opened under the strain, but there was a shred of rotted canvas still attached to the barb.
Eight ounces of lead and a treble hook thudded into the back of Marju’.
Eight ounces of lead and a treble hook thudded into the back of Marjus head.