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 termor, it is au 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. 96
Source: Black's Law Dictionary 2nd Ed (1910)
