Definition: the limit beyond which something happens or changes
Usage: on the verge of tears; on the brink of bankruptcy
Similar words: bound, boundary, limit
Definition: the greatest possible degree of something
Usage: what he did was beyond the bounds of acceptable behavior; to the limit of his ability
Synonyms: brink
Definition: the edge of a steep place
Synonyms: threshold, verge, brink
Definition: a region marking a boundary