Meaning of “flutter” - Learner’s Dictionary

flutter

noun [ C ] uk us /ˈflʌtər/
MOVEMENT

a quick, gentle movement:

the flutter of wings
EMOTION

a state of excitement or worry:

a flutter of excitement
RISK MONEY UK informal

an occasion when you risk money on the result of a game, competition, etc

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