Definitions from Wiktionary (lock down)

▸ verb:  (transitive) To secure (something).
▸ verb:  To blockade and lock (e.g. a building or campus) so as to prevent ingress or egress; to make the occupants (of an area) stay locked indoors for their safety.
▸ verb:  (transitive) To limit the use of (a computer network) to only users with permission.
▸ verb:  (transitive) To make (an arrangement) secure, definite, or permanent; to fix.
▸ verb:  (transitive, slang) To cause (another person) to enter into an exclusive romantic relationship.
▸ verb:  (intransitive, boating) To travel through a flight of locks on a waterway in a downhill direction.

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