I promise I'll be very quick indeed and I'll be back in two ..... of a lamb's tail. (*) moves (*) shakes (*) twitches (*) wags
This is a companion discussion topic for the original entry at https://english.best/questions/4857,i-promise-ill-be-very-quick-indeed-and-ill-be-back-in-two-___-of-a-lambs-tail/