[A valley; a water-course, or torrent-bed: and sometimes a river;] a space intervening, (M, Msb, K,) i. e. any such space, (M, Msb,) between mountains or hills; (M, Msb, K;) through which a torrent runs forth [occasionally or constantly]: (Msb:) for which reason it is thus called. (M, Mgh, TA.)
2.
حَلَّ بِوَادِيهِi. q.بَاعَِ عَلَى بَيْعِهِ in one of the senses explained in article بيع; i. e., (tropical:) He superseded him, &c.