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A sleeveless, slim-fitting, usually knit shirt with shoulder straps and no front opening.
[From its resemblance to a tank suit.]
(Clothing & Fashion) a sleeveless upper garment with wide shoulder straps and a low neck, usually worn over a shirt, blouse, or jumper
[C20: named after tank suits, one-piece bathing costumes of the 1920s worn in tanks or swimming pools]
a low-cut, sleeveless, pullover shirt with shoulder straps, often made of lightweight knitted fabric.