tank top

Etymology
The upper part of a tank suit worn by female swimmers in modester times when swimming pools were called swimming tanks.

Noun

 * 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.
 * 1) The top of a ship's bilge tank, usually the lowest horizontal surface on board.
 * 1) The top of a ship's bilge tank, usually the lowest horizontal surface on board.