bell·weth·er 
/ˈbɛlˈwɛðɚ/ noun
plural bell·weth·ers /ˈbɛlˈwɛðɚ/ noun [count] : someone or something that leads others or shows what will happen in the future
▪ She is a bellwether of fashion. ▪ High-tech bellwethers led the decline in the stock market. ▪ a county that is a bellwether in national elections
▪ She is a bellwether of fashion. ▪ High-tech bellwethers led the decline in the stock market. ▪ a county that is a bellwether in national elections
