plash1 Syllabification: (plash)Pronunciation: /plaSH/ literaryDefinition of plash noun [in singular] a sound produced by liquid striking something or being struck. a pool or puddle. verb [no object] splash:gray curtains of rain plashed down [with object] strike the surface of (water) with a splashing sound. Derivatives plashy adjective Origin: early 16th century: probably imitativeplash in other Oxford dictionaries Definition of plash in the British & World English dictionary