Describing something that flies away easily or is light and wispy, or a person who is flighty and irresponsible.
From 'fly' + 'away' (Old English 'onweg'), originally describing things like dandelion seeds or loose hair that scatter easily in wind.
Medieval observers noticed how dandelion seeds were 'fly-aways'—nature's tiny parachutes—and the word stuck to describe anything that refuses to stay put.
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