Swash/swɑːʃ/ Definition 1 of 4Pro Tip 1/2Onomatopoeic Quality Swash captures the sound of the action it describes, making it easier to envision. The children's feet swashed rhythmically in the shallow water. Pro Tip 2/2Physical Movement 'Swash' often implies a forceful, careless movement through water or mud. The dog swashed through the muddied puddles, splattering dirt everywhere.