Pish. interj. A contemptuous exclamation. This is sometimes spoken and written pshaw. I know not their etymology, and imagine them formed by chance.
There was never yet philosopher
That could endure the toothach patiently;
However they have writ,
And made a pish at chance or sufferance. Shakesp.
She frowned and cried pish, when I said a thing that I stole. Spectator, № 268.