fib
n.
"a lie," especially a little one, "a white lie," 1610s, of uncertain origin, perhaps from fibble-fable "nonsense" (1580s), a reduplication of fable, n..
v.
"tell trifling lies," 1680s, from fib, n.. Seldom, if ever, transitive. Related: Fibbed; fibbing; fibbery.