alarmer
noun
alarm·er
| \ ə-ˈlär-mər\
Definition of alarmer
: an occurrence (such as a building fire) that triggers a specified number of alarms
—used in combination
It took 2¹/₂ hours to put out the fire, a four-alarmer that drew scores of firefighters from neighboring communities. — Ron Devlin, Morning Call (Allentown, Pennsylvania), 5 Oct. 2005
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