In conveyancing . A lease granted by one who is himself a lessee for years, for any fewer or less number of years than he himself holds. If a deed passes all the estate or time of the term or, it is an assignment ; but, if it be for less portion of time than the whole term, it is an under-lease , and leaves a reversion in the termor. 4 Kent, Comm. 9G.
Black’s Law Online Dictionary
