harbinger
C2CEFR level
60/100Rarity: rare
LiteraryRegister
General noun
A person or thing that signals the approach of another.
The first swallows are a harbinger of summer.
Business noun
A person or thing that signals the approach of something, especially a change.
Falling renewal rates were an early harbinger of the churn crisis the account review later confirmed.
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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