watershed
C1CEFR level
55/100Rarity: uncommon
TechnicalRegister
An event or period marking a critical turning point.
The loss of its largest account proved a watershed that forced the firm to rethink its client concentration risk.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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