A large tank of water, in an elevated position, acting as a local reservoir; water is pumped into the tank and fed by gravity to the consumers.

A wheel, propelled by running or falling water, used to power machinery. / A wheel with buckets used to raise water.

To dilute; to add water to. / (idiomatic) To make weaker. / (idiomatic) To simplify or oversimplify; to make easier; to make less difficult. / (idiomatic) To make less restrictive; to make more lenient.

plural of reticulated water

The police department charged with patrolling harbours and waterways by boat.

(automotive, aviation) The process of squirting a small amount of water, in the form of a fine spray, into the air/fuel mixture going into a gasoline piston engine, in order to cool the engine cylinders, and, thereby, reduce detonation or knocking in high performance engines, especially when using a high compression ratio.

plural of water clock

A rest period during the business day (usually of about 10 or 15 minutes), allowing people to fetch a drink.

plural of water rat

A small rubber or latex balloon, filled with water and used as an informal weapon