Webster's Dictionary 
(1): (n.) From side to side; athwart; crosswise, or in a direction opposed to the length; quite over; as, a bridge laid across a river.
(2): (adv.) From side to side; crosswise; as, with arms folded across.
(3): (adv.) Obliquely; athwart; amiss; awry.
Vine's Expository Dictionary of NT Words