from The Century Dictionary.
- noun A natural fly used as bait, or an artificial fly serving as a lure.
Sorry, no etymologies found.
And when that idea didn't go over so well, he took poor Violet to see her decaying, fly-bait of a corpse, which he had stashed in a crawl space beneath the house.
Or, out of the bright waters, boys and men in the sunshine drew out the fish with shining scales, or lured the trout, with fly-bait, from their hiding places.