aBirUha
abhirūha (so Senart with 1 ms. ) or °hana (so v.l. ; = Pali abhirūhana; cf. abhirohaṇa ; to Skt. abhirohati), mounting, ascent : Mv ii.289.8 abhirūha(na)saṃpannāḥ (sattvāḥ, sc. Bodhisattvas; in Pali lit. or fig. of mounting as on a ship, esp. by a gangplank; so presumably here, fig. furnishing a gangplank to salvation).