O. P. Riot (Old Price Riot)
. When the new Covent Garden theatre was opened in 1809, the charges of admission were increased; but night after night for three months a throng crowded the pit, shouting “O. P.” (old prices); much damage was done, and the manager was obliged at last to give way.
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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.