'Trumping' definitions:

Definition of 'trumping'

From: WordNet
noun
(card games) the act of taking a trick with a trump when unable to follow suit [syn: ruff, trumping]

Definition of 'Trumping'

From: GCIDE
  • Trump \Trump\, v. i. [imp. & p. p. Trumped; p. pr. & vb. n. Trumping.] To play a trump card when one of another suit has been led. [1913 Webster]