Fib

Fib, v. i. [imp. & p. p. Fibbed (?); p. pr. & vb. n. Fibbing (?).] To speak falsely. [Colloq.]

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.

Fib, v. t. To tell a fib to. [R.] De Quincey.