Webster's Revised Unabridged Dictionary · 1913

Fib

Fib , noun

[Probably from fable; compare Prov. English fibble-fabble nonsense.]

A falsehood; a lie; -- used euphemistically.
They are very serious; they don't tell fibs. — H. James

Fib , intransitive verb

To speak falsely. [Colloquial]

Fib , transitive verb

To tell a fib to. [Rare] — De Quincey