Swinging bridge

swinging bridge - A bridge that swings away from the waterway so that boats may pass beside it.

(2) A man made structure crossing a body of water, usually for the use of automobiles or train. A boat intending to pass under a bridge needs to make sure it has sufficient vertical clearance unless it is a swinging bridge or a drawbridge.

See also: Bridge, Heads, Give, Vang, Trim