A warning signal (such as the call of sentry, the ringing of a bell, or the shriek of a siren) which turns out to have been given erroneously.
A thing or occurrence which initially causes fear, distress, etc. but which is subsequently recognized as being no cause for concern.
A disappointment or total failure; an unsuccessful person.
An overwhelming victory; a landslide.
An appliance designed to wash something out.
The cleaning of matter from a physiological system using a fluid.
The cleaning of the inside of a (locomotive) boiler to remove scale (limescale).
A breach in a road or railway caused by flooding.
A period between clinical treatments in which any medication delivered as the first treatment is allowed to wash out of the person before the second treatment begins.
The aerodynamic effect of a small twist in the shape of an aircraft wing.
A channel produced by the erosion of a relatively soft surface by a sudden gush of water.
The action whereby falling rainwater clean particles from the air.
A sporting fixture or other event that could not be completed because of rain.