We found one dictionary that defines the word firefighter's rule:

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1. firefighter's rule: Wiktionary

Definitions from Wiktionary (firefighter's rule) ▸ noun:  (law) Synonym of fireman's rule ▸ Words similar to firefighter's rule ▸ Usage examples for firefighter's rule ▸ Idioms related to firefighter's rule ▸ Wikipedia articles (New!) ▸ Words that often appear near firefighter's rule ▸ Rhymes of firefighter's rule ▸ Invented words related to firefighter's rule