Fly-by-night


What's the meaning of the phrase 'Fly-by-night'?

A ‘fly-by-night’ is someone who attempts to evade responsibilities or debts by absconding under cover of darkness. Typically, this may be covertly moving out pf a property to avoid paying the rent.

More generally, ‘fly-by-night’ is applied to any person or business of a poor ‘here today; gone tomorrow’ reputation.

What's the origin of the phrase 'Fly-by-night'?

When it was first used, the term ‘fly-by-night’ didn’t
refer to people who absconded at night, but to
witches, who were believed to literally fly at night.

When ‘fly-by-night’ was first coined in the 18th century it was with a different meaning from the above. A ‘fly-by’night’ was a colloquial term for a witch.

There is no better chronicler of English slang terms of the Georgian period than Captain Francis Grose and he is indeed the first to record this expression in the 1788 edition of his Classical Dictionary of the Vulgar Tongue:

FLY-BY-NIGHT. You old fly-by-night; an ancient term of reproach to an old woman, signifying that she was a witch, and alluding to the nocturnal excursions attributed to witches, who were supposed to fly abroad to their meetings, mounted on brooms.

How the term changed in meaning from the specific and literal ‘witch’ to its present usage isn’t clear. The original form does suggest that the name was used as a slur. It’s quite possible that, on hearing the term, a someone might later use it with a similar negative sense to refer to anyone else who had disappeared overnight.

See other words and phrases recorded by Captain Francis Grose.

Trend of fly – by – night in printed material over time

Gary Martin is a writer and researcher on the origins of phrases and the creator of the Phrase Finder website. Over the past 26 years more than 700 million of his pages have been downloaded by readers. He is one of the most popular and trusted sources of information on phrases and idioms.

Gary Martin

Writer and researcher on the origins of phrases and the creator of the Phrase Finder website. Over the past 26 years more than 700 million of his pages have been downloaded by readers. He is one of the most popular and trusted sources of information on phrases and idioms.