Dictionary Definition:
upa-√dhāv Ā. (p. -dhā́vamāna) to run
• to soar RV. viii, 3, 21: P. -dhāvati, to run near, approach hastily
• to have recourse to for assistance TS. ŚBr. TāṇḍyaBr. MBh. R. BhP. &c