Fly-by-night
Not responsible, reliable or trustworthy, especially in business. A fly-by-night businessman or company want to make money quickly without caring about the quality of the services or products offered.
Origin
The phrase relates to the idea of someone leaving a place quickly in order to evade angry customers or legal authorities after offering poor work or goods, often under the the cover of darkness. Originally it meant a witch flying on a broom about at night.
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Basically, a cup of black tea (Golden Nepal or Assam) would be appreciated since I do not drink coffee.
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