origin of ‘fly-by-night’ (unreliable or untrustworthy)

The noun fly-by-night, or fly-by-nighter, denotes an unreliable or untrustworthy person. As an adjective, fly-by-night means unreliable or untrustworthy, especially in business or financial matters. However, the term seems to go back to the idea of witches flying on their broomsticks by night. At least, its first recorded instance is as a term of contempt […]

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