名詞 bugaboo:

1. an imaginary monster used to frighten children
   同義詞：bogeyman, bugbear, boogeyman, booger
2. a source of concern

bug.a.boo

n.（名詞）
【復數】 bug.a.boos
An object of obsessive, usually exaggerated fear or anxiety:
嚇唬人的東西：用來嚇人的東西，常常夸大了其令人害怕或恐懼的程度：
例句：
.Boredom, laziness and failure . . . These bugaboos, magnified by imagination, keep[the workaholic] running. (Dun`s Review)
.煩惱、懶惰和失敗，這些.攔路虎.被想象夸大了，使得［那些為免遭辭退而忘我工作的人］ 疲于奔命. (鄧恩評論)

A recurring or persistent problem:
令人頭痛的事：反復出現或持續(xù)出現的問題：
例句：
.the bugaboos that have plagued vision systems: high price and slow throughput.(Lawrence A. Goshorn)
.困擾著電視生產系統(tǒng)的難題：高成本與低生產能力.(勞倫斯A.戈斯霍恩)

來源：
[Perhaps of Celtic origin]
[可能起源于凱爾特語]