/ˈflʌtə(r) ||; ˈflʌtɚ/verb1 [I,T] to move or make sth move quickly and lightly, especially through the air （使）轻快地移动（尤指在空中）: The flags were fluttering in the wind. 旗帜在风中飘扬。The bird fluttered its wings and tried to fly. 小鸟振翅欲飞。
2 [I] your heart or stomach flutters when you feel nervous and excited （心脏或胃部因紧张、兴奋而）快速跳动