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English definition of “flutter”


verb [I] (HEART/STOMACH)    /ˈflʌt.ər/ US  /ˈflʌt̬.ɚ/
If your heart or stomach flutters, you feel slightly uncomfortable because you are excited or nervous : Every time I think about my exams my stomach flutters!Shaking, swinging and vibrating
(Definition of flutter verb (HEART/STOMACH) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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