Hypertext Webster Gateway: "Pshaw"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pshaw \Pshaw\, v. i.
To express disgust or contemptuous disapprobation, as by the
exclamation `` Pshaw!''
The goodman used regularly to frown and pshaw wherever
this topic was touched upon. --Sir W.
Scott.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pshaw \Pshaw\, interj. [Of imitative origin.]
Pish! pooch! -- an exclamation used as an expression of
contempt, disdain, dislike, etc. [Written also {psha}.]
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