emergency cord
From Longman Dictionary of Contemporary EnglishRelated topics: Trains & railwaysemergency cordeˈmergency ˌcord noun [countable] American English TTTa chain that a passenger pulls to stop a train in an emergency SYN communication cord British EnglishExamples from the Corpusemergency cord• That coppery twang on the emergency cord that hangs tight in his gut.• An officer allegedly pulled the emergency cord as a joke.