IPA: /ˈbɛlˌwɛðər/
KK: /ˈbɛlˌwɛðər/
A person or thing that leads or indicates trends or future developments.
The new technology is seen as a bellwether for the future of the industry.
**Bellwether** → The word is formed from "bell" (from Old English *belle*, meaning a ringing instrument) and "wether" (from Old English *wether*, meaning a male sheep). A bellwether originally referred to a male sheep that wore a bell, leading the flock, and has come to mean a leader or an indicator of trends.
Imagine a sheep wearing a bell, leading the flock — that's why a bellwether is someone or something that leads or indicates trends.
No commonly confused words.