| for keeps |
| for mercy's sake |
| for one's particular |
| for pity's sake |
| for show |
| for the asking |
| for the hell of it |
| for the love of the game |
| for this once |
| for two pins |
| fossilized |
| four-eyes |
| fourscore |
| fourth estate |
| fox sleep |
| free-for-all |
| freeze out |
| French leave |
| fresh off the boat |
| fret the gizzard |
| friend with benefits |
| frog in one's throat |
| from can see to can't see |
| from dawn to dusk |
| from my cold, dead hands |
| from scratch |
| from the East German judge |
| from the rooter to the tooter |
| front and center |
| fruit of one's loins |
| fry up |
| fuck if I know |
| fuck knows |
| fuck's sake |
| fuck you |
| full butt |
| full of beans |
| full of piss and vinegar |
| full tilt |
| full whack |
| funny-looking |
| faceless bureaucrat |
| face like the back end of a bus |
| fact of life |
| facts on the ground |
| fair coin |
| fair game |
| fair to middling |
| fairy money |
| fall behind |
| fall by the wayside |
| fall in line |
| fall into place |
| fall off one's perch |
| fall off the turnip truck |
| fall on someone's neck |
| fall over |
| fall victim |
| false note |
| fangful |
| far be it |
| farm out |
| fart in an elevator |
| fast asleep |
| fat finger |
| Faustian dilemma |
| feathered friend |
| federal case |
| feed off |
| feel around |
| feel one's way |
| fee simple absolute in possession |
| fence in |
| fend away |
| fetch way |
| fickle mistress |
| fifth-rate |
| fight fire with fire |
| fighting spirit |
| fill in |
| fill one's face |
| filter up |
| final cut |
| finders, keepers; losers, weepers |
| find one's ass with both hands and a flashlight |
| find one's voice |
| fine-feathered friend |
| finest hour |
| finish with |
| fire in the belly |
| fire the starting gun |
| first annual |
| first love |
| first of never |
| first up |
| fish or cut bait |
| fish to fry |
| fit the bill |
| five-star |
| flagellate |
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