n the noise of a rounded object dropping into a liquid without a splash
v drop something with a plopping sound
v drop with the sound of something falling into water
v set (something or oneself) down with or as if with a noise
n. 扑通声, 啪嗒声( plop的名词复数 )
v. 扑通地坠落( plop的第三人称单数 )