What is "crossruff"

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.

n. (context bridge English) A play in which tricks are taken by taking alternate ruffs in each hand vb. To execute a crossruff

v. trump alternately in two hands