subs. phr. (political).A constituency in which votes are controlled by one man: theoretically, since the Reform Act of 1832, a thing of the past; TO POCKET A BOROUGH = to control votes.
1872. G. ELIOT, Middlemarch, xlvi. When I think of Burke I cant help wishing somebody had a POCKET-BOROUGH to give you, Ladislaw. POCKET-BOROUGHS would be a fine thing, said Ladislaw, if they were always in the right pocket, and there were always a Burke at hand.
1882. J. SCHOULER, History of the United States of America under the Constitution, i. 10. He was loyal to some one of the blood families who contended for the honor of POCKETING the borough in which he voted.