Right bower

the knave of the trump suit, the highest card (except the "Joker") in the game.

See also: Bower

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in classic literature ?
So you see there was simply nothing to be done now, but play their right bower -- bring out the superbest of the superb, the mightiest of the mighty, the great Sir Launcelot himself!
To quote him, "Natural gas, the cleanest, slickest, handiest fuel that ever warmed a heart or tenement, is the right bower of crude petroleum.