English
racerback
From racer + back.
Proto-Germanic *baką ‘back’
Proto-West Germanic *bak
Old English bæc
Middle English bak ‘the back’
English back
Today it means
noun An item of clothing, such as a shirt or bra, with straps that meet high on the back.
Language periods are conventional ranges, not dates for this word.
Etymograph / racerback