fireplug
FY-ur-plug/ˈfaɪɚˌplʌɡ/UKFY-uh-plug/ˈfaɪ(ə)plʌɡ/
Pluralfireplugs
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Origin
From fire + plug, referring to the system used before fire hydrants, in which a large plug was placed into a hole in the water main and covered with a barrel; the plug was removed when water was needed.