A device for measuring time by letting water flow out of a container, usually through a tiny aperture. / A clepsydra.

(idiomatic, figuratively) A dangerous situation; trouble. / (idiomatic, figuratively) fierce criticism / Used other than figuratively or idiomatically: see hot, water.

Alternative spelling of limewater

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