(vir) v.i.
1. Naut. To turn to another course; wear ship.
2. To change direction by a clockwise motion, as the wind.
3. To shift from one position to another; be variable or fickle.
—v.t.
4. To change the direction of. See synonyms under CHANGE, FLUCTUATE, WANDER.
—noun A change in direction; a swerve. [<F virer turn]

(vir) v.t. & v.i. Naut.
To let out or allow (a rope, anchor chain, etc.) to run out to a certain length. [<MDu. vieren slacken]