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