a·cross 
(ə-krôs, ə-krŏs)
(ə-krôs, ə-krŏs)prep.
1. On, at, or from the other side of: across the street.
2. So as to cross; through: drew lines across the paper.
3. From one side of to the other: a bridge across a river.
4. Into contact with: came across my old roommate.
adv.
1. From one side to the other: The footbridge swayed when I ran across.
2. On or to the opposite side: We came across by ferry.
3. Crosswise; crossed.
4. In such a manner as to be comprehensible, acceptable, or successful: put our idea across; get a message across.
adj.
Being in a crossed position: seated with arms across.
[Middle English acrois, from Anglo-Norman an croiz : an, in (from Latin in; see IN-2) + croiz, cross (from Latin crux; see CROSS).]