ALL meanings of water key
wa·ter key
W w - noun water key a lever to drain saliva from a brass musical instrument, as the trombone. 1
- noun water key A valve or tap for the drainage of accumulated fluid from musical instruments such as trombones or trumpets; a spit valve. 0
- noun water key A rod used to open and close a buried quarter-turn water valve, as in a water main. 0