Dictionary

bellwether

noun bell·weth·er \ˈbel-ˈwe-thər, -ˌwe-\

: someone or something that leads others or shows what will happen in the future

Full Definition of BELLWETHER

:  one that takes the lead or initiative :  leader; also :  an indicator of trends
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Origin of BELLWETHER

Middle English, leading sheep of a flock, leader, from belle bell + wether; from the practice of belling the leader of a flock
First Known Use: 13th century

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