Crossruff

from WordNet (r) 3.0 (2006)

crossruff
    v 1: trump alternately in two hands

from 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]