firebug

[ fahyuh r-buhg ]
/ ˈfaɪərˌbʌg /

noun Informal.

arsonist; incendiary; pyromaniac.

Origin of firebug

An Americanism dating back to 1870–75; fire + bug1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for firebug

firebug
/ (ˈfaɪəˌbʌɡ) /

noun

informal a person who deliberately sets fire to property
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012