Hypertext Webster Gateway: "boh"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Bo \Bo\, interj. [Cf. W. bw, an interj. of threatening or
frightening; n., terror, fear, dread.]
An exclamation used to startle or frighten. [Spelt also {boh}
and {boo}.]
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