The Collaborative International Dictionary of English v.0.48:

Crossruff \Cross"ruff`\ (-r?f`), n. (Whist)
   The play in bridge or whist where partners trump each a
   different suit, and lead to each other for that purpose; --
   called also seesaw.
   [1913 Webster]

WordNet (r) 3.0 (2006):

crossruff
    v 1: trump alternately in two hands