cross·ruff 
(krôsrŭf′, -rŭf, krŏs-)
(krôsrŭf′, -rŭf, krŏs-)n.
A series of plays in games of the whist family in which partnership hands alternately trump suits led by the other partner.
v. cross·ruffed, cross·ruff·ing, cross·ruffs
v.intr.
To perform a crossruff or a series of crossruffs.
v.tr.
To trump (one's partner's lead or a lead from the dummy) in alternating plays.