Source : Webster's Revised Unabridged Dictionary (1913)

Brink \Brink\, n. [Dan. brink edge, verge; akin to Sw. brink
   declivity, hill, Icel. brekka; cf. LG. brink a grassy hill,
   W. bryn hill, bryncyn hillock.]
   The edge, margin, or border of a steep place, as of a
   precipice; a bank or edge, as of a river or pit; a verge; a
   border; as, the brink of a chasm. Also Fig. ``The brink of
   vice.'' --Bp. Porteus. ``The brink of ruin.'' --Burke.

         The plashy brink of weedy lake.          --Bryant.

Source : WordNet®

brink
     n 1: a region marking a boundary [syn: {threshold}, {verge}]
     2: the edge of a steep place
     3: the limit beyond which something happens or changes; "on the
        verge of tears"; "on the brink of bankruptcy" [syn: {verge}]