bellwether
Bellwether (noun) means something or someone that signals which way a trend, market or opinion is about to move. Example: “Ohio has long been treated as a bellwether in presidential elections.”
How to use bellwether
Learner’s notesIn plain EnglishSomething that shows early which way things are going.
Common in political and financial writing; slightly formal in everyday speech.
The second half is wether (a sheep), not weather. Nothing to do with rain.
Trace the full origin ↓Fill the gap
Can you complete this real example?
Ohio has long been treated as a _____ in presidential elections.
Etymology
From Middle English, literally a wether (a castrated ram) wearing a bell so the rest of the flock would follow it.