Plop/plɑːp/ Definition 1 of 4Pro Tip 1/2Soft Sound Indication Use 'plop' to describe a gentle sound made when an object falls into liquid, not loud noises. A single berry plopped into the creamy yogurt. Pro Tip 2/2Light Object 'Plop' often implies a small or lightweight object is dropped, not heavy items. The cherry plopped into the glass without a splash.