Sandbank is a compound of sand + bank; sand from Old English sand and bank from Middle English banke ('ridge, mound'), of Scandinavian origin. The historical chain includes Old English sand and Middle English banke. Older glosses in the chain include "ridge, mound", which help explain the semantic range of the modern word. Morphologically, sandbank is best read as compound and borrowing, yielding an English noun shaped by both form history and later usage. In current English it functions as a noun, with the sense "a raised bank of sand in a river or sea, often a hazard to boats". related forms include sand, bank, and sandbar. The result is an English noun whose etymology preserves the older forms while supporting the word's specialized modern meaning.