(a) To secure (a gate, a door) with bars or a bolt; to bar, block, or bolt; barren to; (b) to lock (a room); (c) to lock (sb.) up. …

(a) Naut. A streamer or pennant attached to the mast of a ship and serving as an identification of the vessel or as a signal flag during battles; (b) a streamer on a standard; also, eccl., a pennant……