Pro.’s.

Professionals—that is, actors by profession.

“A big crowd slowly gathers,

And stretches across the street;

The pit door opens sharply,

And I hear the trampling feet;

And the quiet pro.’s pass onward

To the stage-door up the court.”

Sims: Ballads of Babylon; Forgotten, etc.

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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.