FIB

Source: 566, 567

fib. Fib, n. a lie, a falsehood, story, untruth

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Fib (?), n. [[Prob. fr. fable; cf. Prov. E. fibble-fabble nonsense.]] A falsehood; a lie; — used euphemistically. They are very serious; they don't tell fibs. H. James.