underruff (third-person singular simple presentunderruffs, present participleunderruffing, simple past and past participleunderruffed)
(bridge) To ruff with a trump lower than the trump already played by one's opponent
1973, Fred L. Karpin, The Art of Card Reading at Bridge[1], →ISBN, page 149:
And so, at trick five, when South ruffed a diamond with the board's queen of clubs, East, having a discard to make, found a gorgeous one— he underruffed with seven of trumps!