- brink, threshold, verge - a region marking a boundary
--1 is a kind of boundary, edge, bound
- brink - the edge of a steep place
--2 is a kind of edge, border
- verge, brink - the limit beyond which something happens or changes; "on the verge of tears"; "on the brink of bankruptcy"
--3 is a kind of limit, bounds, boundary
- verge, brink - the limit beyond which something happens or changes; "on the verge of tears"; "on the brink of bankruptcy"