verb
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(intransitive) To flap or wave quickly but irregularly.
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(intransitive) Of a winged animal: to flap the wings without flying; to fly with a light flapping of the wings.
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(intransitive, aerodynamics) To undergo divergent oscillations (potentially to the point of causing structural failure) due to a positive feedback loop between elastic deformation and aerodynamic forces.
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(transitive) To cause something to flap.
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(transitive) To drive into disorder; to throw into confusion.
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(intransitive) To be in a state of agitation or uncertainty.
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(intransitive, obsolete) To be frivolous.
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(espionage, slang) To subject to a lie detector test.