Plural of brink; the edges of cliffs, precipices, or critical points where something is about to change drastically.
From 'brink' (Old English 'brinc,' of uncertain origin but likely related to Germanic words for 'edge'). The plural simply adds the standard '-s' to refer to multiple brinks.
We're always on the 'brink' of something—the brink of tears, the brink of success, the brink of disaster—it's a word about being right on the edge, and what happens next changes everything!
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