An area of sea that has not been surveyed, or whose details have not been entered on nautical charts. / (figuratively, in the plural) Any unknown and potentially dangerous situation.

Alternative spelling of water vapor

(nautical) A small boat that can transport small groups of passengers for a fee

To remain afloat in the water without use of any buoyancy aid, by using kicking motions and hand motions. / (figuratively) To make no progress, expending effort just enough to maintain a stable position.

Alternative spelling of watershed

high tides

A solution of chlorine in water used as a bleaching agent

(law) Shares of stock in a business that are inflated by parties colluding with the seller making inflated offers for the property that the stock represents, which are reported to potential sellers as indicative of the value of the stock.

(geology) The level, underground, below which the ground is saturated with water. / (architecture) A molding or other projection in the wall of a building to throw off rainwater.

The level of a body of water, especially when measured above a datum line. / The level of the water table below ground. / The waterline of a ship.