Longman Dictionary of Contemporary English
tank top
noun
EXAMPLES FROM CORPUS
▪ Cindy's loose hair and sporty tank top are used to suggest a late twentieth-century femininity which is supposedly more liberated.
▪ Consider the image of the Mona Lisa on a tank top.
▪ I take off my jumper and stand in my tank top, sipping a whiskey I have been bought.
▪ It looked great for about ten minutes but now it's as pertinent as the tank top.
▪ She wore a red tank top, black jeans, high white sneakers.
The Collaborative International Dictionary
Tank top
Tank top \Tank" top`\, n. a sleeveless and collarless shirt with wide shoulder straps and no front opening, often close-fitting and low-cut.
Douglas Harper's Etymology Dictionary
tank top
1968, from tank suit "one-piece bathing costume" (1920s), so called because it was worn in a swimming tank (n.), i.e. pool.
Wiktionary
tank top
alt. 1 An item of casual clothing: a top with no sleeves. 2 The top of a ship's bilge tank, usually the lowest horizontal surface on board. n. 1 An item of casual clothing: a top with no sleeves. 2 The top of a ship's bilge tank, usually the lowest horizontal surface on board.
WordNet
tank top
n. a tight-fitting sleeveless shirt with wide shoulder straps and low neck and no front opening; often worn over a shirt or blouse