to move quickly and lightly
The flag began to flutter in the wind.
旗が風にはためき始めた。
to move wings quickly up and down
The bird's wings flutter as it takes off.
鳥が飛び立つとき、翼をはためかせる。
to fly with quick wing movements
The butterfly will flutter around the garden.
蝶が庭をひらひらと飛び回る。
to beat quickly and unevenly
His heart started to flutter with nervousness.
緊張で彼の心臓が鼓動し始めた。
a quick, light movement
A gentle flutter of leaves fell from the tree.
木から葉がひらひらと優しく落ちた。
a small bet
He placed a flutter on the game.
彼はその試合に小さな賭けをした。
a state of nervous excitement
She was in a flutter before her speech.
スピーチの前、彼女はそわそわしていた。
a fast, uneven heartbeat
A sudden flutter made her catch her breath.
突然の動悸で彼女は息をのんだ。
an unsteady heartbeat condition
The doctor detected a flutter during the checkup.
医師は検診中に不整脈を検出した。
rapid changes in sound pitch or volume
The recording had a noticeable flutter in the audio.
録音には音声に顕著な揺れがあった。