Definitions
1.VerbTo flap or wave quickly but irregularly."flags fluttering in the wind"
2.VerbOf a winged animal: to flap the wings without flying; to fly with a light flapping of the wings.
3.VerbTo undergo divergent oscillations (potentially to the point of causing structural failure) due to a positive feedback loop between elastic deformation and aerodynamic forces.
4.VerbTo cause something to flap."A bird flutters its wings."
5.VerbTo drive into disorder; to throw into confusion.
6.VerbTo be in a state of agitation or uncertainty.
7.VerbTo be frivolous.
8.VerbTo subject to a lie detector test.
9.NounThe act of fluttering; quick and irregular motion."the flutter of a fan"
10.NounA state of agitation.
11.NounAn abnormal rapid pulsation of the heart.
12.NounAn extremely dangerous divergent oscillation caused by a positive feedback loop between the elastic deformation of an object and the aerodynamic forces acting on it, potentially resulting in rapid structural failure.
13.NounA small bet or risky investment.
14.NounA hasty game of cards or similar.
15.NounThe rapid variation of signal parameters, such as amplitude, phase, and frequency.