fireplug
FY-ur-plug/ˈfaɪɚˌplʌɡ/UKFY-uh-plug/ˈfaɪ(ə)plʌɡ/
Pluralfireplugs
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Origin
From "fire" plus "plug." It comes from an old system where a large plug was put in the water main and pulled out when water was needed to fight fire.