To flap or wave quickly but irregularly.
To be in a state of agitation or uncertainty.
To subject to a lie detector test.
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.
A state of agitation.
The rapid variation of signal parameters, such as amplitude, phase, and frequency.
A small bet or risky investment.
The act of fluttering; quick and irregular motion.
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 hasty game of cards or similar.
An abnormal rapid pulsation of the heart.
To use a snorkel.
A snorkel parka.
A retractable tube fitted in diesel-engine submarines to allow sufficient ventilation that the engines may be used at periscope depth.
A hollow tube, held in the mouth, or mounted on and opening into a diving mask, used by swimmers for breathing underwater.