What is the meaning of Flutter?

To flap or wave quickly but irregularly.

Of a winged animal: to flap the wings without flying; to fly with a light flapping of the wings.

To undergo divergent oscillations (potentially to the point of causing structural failure) due to a positive feedback loop between elastic deformation and aerodynamic forces.

To cause something to flap.

To drive into disorder; to throw into confusion.

To be in a state of agitation or uncertainty.

To be frivolous.

To subject to a lie detector test.

The act of fluttering; quick and irregular motion.

A state of agitation.

An abnormal rapid pulsation of the heart.

An 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.

A small bet or risky investment.

A hasty game of cards or similar.

The rapid variation of signal parameters, such as amplitude, phase, and frequency.

Source: wiktionary.org