Lacking a back or rear support, especially describing clothing or furniture with an open back, or lacking backside/posterior protection or coverage.
From 'back' (rear/support) + '-less' (without). Standard English negation formation that can apply to both physical objects and figurative concepts.
Backless dresses became fashionable not because they're practical—they're the opposite—but because removing the back paradoxically makes something feel more elegant and daring.
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