Collins Chinese Dictionary Plus (3rd edition), 2011:
flutter [ˈflʌtər]
I vi
1
[bird] 拍翅 pāichì
[flag, clothes] 飘(飄)动(動) piāodòng
[flag, clothes] 飘(飄)动(動) piāodòng
2
[heart, stomach] 悸动(動) jìdòng
II vt
[+ wings] 拍 pāi
III n
[s]
1
[of wings] 拍动(動) pāidòng
[of cloth] 飘(飄)动(動) piāodòng
[of cloth] 飘(飄)动(動) piāodòng
2
[of panic, excitement] 一阵(陣)心绪(緒)不宁(寧) yī zhèn xīnxù bùníng