vbl. sb. Obs. [f. prec. v. + -ING1.] Descending, descent; declivity.
c. 1380. Sir Ferumb., 984. At aualyng of an hulle; þe frensche han þey of-take.
c. 1430. Lydg., Bochas, I. i. (1544), 1 b. Rivers … In their upspringing and avayling down.
1523. Ld. Berners, Froiss., I. xviii. 23. They … ordeyned iii. great battelles, in the auaylynge of the hyll.
