—v.i. 1. to make a sound like that of something falling or dropping into water: A frog plopped into the pond. 2. to fall with such a sound: Big raindrops plopped against the window. 3. to drop or fall with full force or direct impact: He plopped into a chair.
—v.t. 1. to drop or set down heavily: She plopped her books on the desk. 2. to cause to plop: The fisherman plopped the bait into the river.
—n. 1. a plopping sound or fall.
2. the act of plopping.
—adv. with a plop: The stone fell plop into the water.