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Webster 1913 Edition

int

erj.

[Cf. W.

, an interj. of threatening or frightening; n., terror, fear, dread.]

An exclamation used to startle or frighten.

[Spelt also

boh

and

boo

, exclam. A word of terror; a customary sound uttered by children to frighten their fellows.

See also: Appendix:Variations of "bo"

bǒ (Zhuyin ㄅㄛˇ)