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Definitions of inlock:
verb: (transitive) To lock in.
verb: (transitive) To enclose.
noun: A locking in.
noun: That which is locked in.
noun: An inner or interior lock.
noun: (law, UK dialectal, Northern England) Any corner or part of a common field plowed up and sowed with oats, etc. and sometimes fenced in with a dry hedge while the lave of the field lies fallow and common.