lock down
动词- To secure (something).
- 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. · Police have the area locked down until the situation is all-clear.
- To limit the use of (a computer network) to only users with permission.
- To make (an arrangement) secure, definite, or permanent; to fix.
- To cause (another person) to enter into an exclusive romantic relationship. · It took me some time, but I finally locked her down.
- To travel through a flight of locks on a waterway in a downhill direction.
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