Cleaner's sluice
When I went to the restroom at Heathrow Terminal 5 in London, I was stopped in my tracks by the sign "Cleaner's Sluice" on a door just outside. I knew what a "sluice" was, in fact I knew several related meanings for sluice:
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- An artificial passage for water, fitted with a valve or gate, for example in a canal lock or a mill stream, for stopping or regulating the flow.
- A water gate or floodgate.
- Hence, an opening or channel through which anything flows; a source of supply.
- The stream flowing through a floodgate.
- (mining) A long box or trough through which water flows, used for washing auriferous earth.
- (linguistics) An instance of wh-stranding ellipsis, or sluicing.
(Wiktionary)
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