fast one

noun Informal.
a shrewd action, especially when unscrupulous or dishonest; an unfair trick, deceitful practice, dishonest dealing, etc.: He pulled a fast one on me by paying me with a worthless check.

Origin:
1920–25, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
First, it pulls a bit of a fast one on the reader from the start.
Encouraged members to fast one day a month and donate the savings to help the needy.
Speed describes how fast one is moving, eg, in knots or mph.
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