名詞 bellwether:

1. someone who assumes leadership of a movement or activity
2. sheep that leads the herd often wearing a bell

bell.weth.er

n.（名詞）
One that serves as a leader or as a leading indicator of future trends:
首領，先兆：作為領導者或對未來趨勢作出指示者的人或事：
例句：
.The degree to which the paper is censored is a political bellwether.(Justine De Lacy)
.對報紙審查的程度是一個政治預兆.(朱斯蒂娜·德·萊西)

來源：
Middle English bellewether [wether with a bell hung from its neck, leader of the flock]
中古英語 bellewether [脖子上掛著鈴的閹羊，群首]
belle [bell] * see bell
belle [鈴] *參見 bell
wether [wether] * see wether
wether [閹羊] *參見 wether