On, at, or from the other side of: across the street. So as to cross; through: drew lines across the paper. From one side of to the other: a bridge across a river. Into contact with: came across my old roommate. From one side to the other: The footbridge swayed when I ran across. On or to the opposite side: We came across by ferry. Crosswise; crossed. In such a manner as to be comprehensible, acceptable, or successful: put our idea across; get a message across. Being in a crossed position: seated with arms across.