Definitions for "Batten down"
Also batten the hatches. To put away all loose objects on the ship and to close all openings, such as ports and hatches, in preparation for heavy weather. Hatches used to be secured with battens.
To close or make watertight, usually referring to hatches.
To secure or make watertight, especially hatches and cargo
Keywords:  sails, pockets, expressions
Expressions Batten Pockets Sails
Keywords:  shut, closed, secure
To secure closed or shut.