Definition of bugbear noun from the Oxford Advanced Learner's Dictionary

 

bugbear

 noun
noun
BrE BrE//ˈbʌɡbeə(r)//
 
; NAmE NAmE//ˈbʌɡber//
 
(especially British English)
 
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a thing that annoys people and that they worry about Inflation is the government's main bugbear. Word Origin late 16th cent.: probably from obsolete bug ‘bogey’ (of unknown origin) + the noun bear.
See the Oxford Advanced American Dictionary entry: bugbear