1A high-cut undergarment or swimsuit having only a thin strip of material passing between the buttocks.
- ‘If you want lined T-backs, you need to check the reputable online shops.’
- 1.1A style of back on a bra or bikini top in which the shoulder straps meet a supporting lateral strap below the shoulder blades.
- ‘Larger breasted women usually prefer racerbacks or T-backs because they offer more support.’
- ‘Just follow the advice given above, and soon you'll be wearing the T-back tank top.’