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English definition of “lock someone out”

lock someone out

phrasal verb with lock    /lɑk/ verb [I/T]
to prevent someone from getting into a building, room, or vehicle: I forgot that my dad didn't have keys, and I locked him out of the house. The door slammed and our keys were inside – so we were locked out (= unable to get in).
(Definition of lock someone out from the Cambridge Academic Content Dictionary © Cambridge University Press)
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