'coaster' originates from the word 'coast,' which comes from Old French 'coste,' meaning 'side' or 'rib.'

'coast' evolved from the Latin word 'costa,' meaning 'rib' or 'side,' and eventually became the modern English word 'coast.'

Initially, it referred to the side or rib of something, but over time it evolved to mean the edge of land along the sea and later to objects or people associated with the coast.