Meaning of “barometer” - Learner’s Dictionary

barometer

noun [ C ] uk us /bəˈrɒmɪtər/
OPINION

a way of showing what people think or what the quality of something is:

Car sales are viewed as a barometer of consumer confidence.
WEATHER

a piece of equipment that measures air pressure (= the force of the air) and shows when the weather will change

(Definition of “barometer” from the Cambridge Learner’s Dictionary © Cambridge University Press)