rear-end

The compound noun 'rear-end' is a straightforward combination of two native English words, both with Germanic origins. 'Rear', derived from a verb meaning 'to raise', evolved to denote the back part of something, likely from the concept of the raised or hindmost section. 'End' has consistently meant a terminal point or boundary. The literal combination, meaning 'the back extremity', was first applied to objects and later specifically to vehicles. The verb form, meaning to collide with the back extremity of another vehicle, is a 20th-century American English development, showcasing a typical pattern where a noun compound is converted into a phrasal verb to describe an action directly related to it.

Structure: rear (back) + end (extremity) - rear: From Old English rǣran (to raise, set upright), but influenced by Old French rere (behind). In this compound, it functions as an adjective meaning 'back' or 'hindmost'. - end: From Old English ende (end, limit, boundary). In this compound, it functions as a noun meaning 'extremity' or 'terminal part'.