firebug

[fahyuhr-buhg]
noun Informal.
arsonist; incendiary; pyromaniac.

Origin:
1870–75, Americanism; fire + bug1

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Collins
World English Dictionary
firebug (ˈfaɪəˌbʌɡ)
 
n
informal a person who deliberately sets fire to property

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica
Encyclopedia

firebug

a species of insect in the stinkbug family, Pentatomidae (order Heteroptera), that sucks sap and chlorophyll from crops, such as cabbage, causing them to wilt and die. Though of tropical or subtropical origin, this insect now ranges from the Atlantic Ocean to the Pacific Ocean in North America. The harlequin cabbage bug is shield-shaped, about 1.25 centimetres (0.5 inch) long, and brilliantly coloured with red, yellow, and black. Fifty to 60 adult harlequin bugs may be found feeding simultaneously on one large plant, and both adult and immature bugs are often found together.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Or it could have been a drooling firebug looking for a safe corner to set a fire.
He bore a shadowed name as a firebug, having burned three buildings for insurance.
Synonyms
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