From Longman Dictionary of Contemporary Englishbe on the cusp of somethingbe on the cusp of something[singular] to be at the time when a situation or state is going to change The country was on the cusp of economic expansion. → cusp
Examples from the Corpus
be on the cusp of something• With plans to add another 100 staff by April, it is on the cusp of breaking into the big league.• They will be on the cusp of puberty. 