far be it» A disclaimer stating that the person speaking will not do something.
fat lip» A swelling on the lip, especially one resulting from a punch or other blow.
feed a cold, starve a fever» Eating more will cure the common cold, and eating less will cure a fever.1887, J. H. Whelan, "The Treatment of Colds.", The Practitioner, vol. 38, pg. 180:"Feed a cold, starve a fever." There is a deal of wisdom in the first part of this advice. A person with a catarrh should take an abundance of light nutritious food, and some light wine, but avoid spirits, and above all tobacco.1968, Katinka Loeser, The Archers at Home, publ. Atheneum, New York, pg. 60:I have a cold. 'Feed a cold, starve a fever.' You certainly know that.2009, Shelly Reuben, Tabula Rasa, Houghton Mifflin Harcourt, ISBN 015101079X, pg. 60:They say feed a cold, starve a fever, but they don't tell you what to do when you got both, so I figured scrambled eggs, tea, and toast.
fight off» To succeed in defeating a challenge, or an attack.
final cut» A group, after a selection process getting rid of other candidates.
first things first» Deal with matters of highest priority first; deal with matters in logical sequence.1922, H. G. Wells, The Secret Places of the Heart, ch.4,"First things first," said Sir Richmond. If we set about getting fuel sanely, if we do it as the deliberate, co-operative act of the whole species, then it follows that we shall look very closely into the use that is being made of it.1999, Frank Pellegrini, "House Republicans Quell Mutiny Over Tax Bounty," Time, 23 Jul.,Judging by the polls
fish or cut bait» To choose between taking action now, or forgoing the opportunity and putting that energy into another endeavor; to decide.
fishing expedition» A non-specific search for information, especially incriminating information.