'Brink' definitions:

Definition of 'brink'

noun

A region marking a boundary [syn: brink, threshold, verge]

noun

The edge of a steep place

noun

The limit beyond which something happens or changes; "on the verge of tears"; "on the brink of bankruptcy" [syn: verge, brink]

From: GCIDE

Brink \Brink\ (br[i^][ng]k), 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. [1913 Webster]
The plashy brink of weedy lake. --Bryant. [1913 Webster] brinkmanship