Толковый словарь английского языка - flutter

I. verb see: fleet Date: before 12th century intransitive verb to flap the wings rapidly, 2. to move with quick wavering or flapping motions, to vibrate in irregular spasms, to move about or behave in an agitated aimless manner, transitive verb to cause to ~, ~er noun ~y adjective II. noun Date: 1641 an act of ~ing, 2. a state of nervous confusion or excitement, flurry, commotion, abnormal spasmodic ~ing of a body part , 3. a distortion in reproduced sound similar to but of a higher pitch than wow, fluctuation in the brightness of a television image, an unwanted oscillation (as of an aileron or a bridge) set up by natural forces, a small speculative venture or gamble