the mind > possession > taking > stealing or theft > robbery > rob [verb (intransitive)] > rob on highway (5)
to go (also Middle English wade) a-fishing. transferred (nonce-use) To rob on the highways.
intransitive. To practise highway robbery, usually on foot. Obsolete.
intransitive. To act or behave in the manner of a footpad. Chiefly with about. Also transitive with it.