The Collaborative International Dictionary of English v.0.48:

Ruff \Ruff\, v. t. [imp. & p. p. Ruffed; p. pr. & vb. n.
   Ruffing.]
   1. To ruffle; to disorder. --Spenser.
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   2. (Mil.) To beat with the ruff or ruffle, as a drum.
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   3. (Hawking) To hit, as the prey, without fixing it.
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   4. (Card Playing) To play a trump card at bridge; as, he
      ruffed his partner's ace.
      [PJC] Ruff