'Chain locker' definitions:

Definition of 'Chain locker'

From: GCIDE

Locker \Lock"er\, n.
1. One who, or that which, locks. [1913 Webster]
2. A drawer, cupboard, compartment, or chest, esp. one in a ship, that may be closed with a lock. [1913 Webster]
Chain locker (Naut.), a compartment in the hold of a vessel, for holding the chain cables.
Davy Jones's locker, or Davy's locker. See Davy Jones.
Shot locker, a compartment where shot are deposited. --Totten. [1913 Webster]