Spank is from of imitative or echoic origin, first attested in the 18th century, the word suggesting the sharp sound of a slap. Morphologically, spank is best read as imitative formation, yielding an English verb and noun shaped by both form history and later usage. In current English it functions as a verb and noun, with the sense "to slap on the buttocks with the open hand as punishment". English derivatives include spanking and spanker. The result is an English verb and noun whose etymology preserves the older forms while supporting the word's specialized modern meaning.