The word 'splash' is a classic example of onomatopoeia, formed in the early 18th century to imitate the sharp, sudden sound of a liquid being struck or something heavy falling into it. It belongs to a group of expressive English words beginning with 'spl-' that suggest vigorous, often wet, activity, such as 'splatter', 'splutter', and 'splinter'. This direct sound-symbolism provides an intuitive link between the word's form and its meaning, bypassing the need for a complex etymological derivation from classical languages. The logic of its evolution is purely phonetic and sensory, moving from an imitation of a sound to describing both the sound itself and the visual action that produces it.

The word is an onomatopoeic simplex, imitating the sound of liquid being disturbed. Its functional role is to directly represent a sound and its associated action.