TO HAVE THE WHIP-HAND (or WHIP-HANDLE), verb. phr. (colloquial).To have an advantage, to be in a position to command, to have the best of a matter.
1692. DRYDEN, Juvenal, Dedication. The archangel HAS THE WHIP HAND OF HER.
1697. VANBRUGH, Æsop, v. 1. Lear. Now, what say you, Mr. Flamefire? I shall HAVE THE WHIP-HAND of you presently.
1887. The Field, 24 Dec. A scheme to get the WHIP-HAND over them.
1889. The Century Magazine, xxxviii. Oct., 932. Why, what matter? They know that we shall KEEP THE WHIP-HANDLE.