| fall out of the ugly tree and hit every branch | | | |
| fall short | | | |
| false light | | | |
| fancy one's chances | | | |
| far and away | | | |
| fare thee well | | | |
| fart fan | | | |
| fashionably late | | | |
| fat chance | | | |
| fat of the land | | | |
| feast or famine | | | |
| feather in one's cap | | | |
| feeding frenzy | | | |
| feed the fire | | | |
| feel free | | | |
| feel someone's collar | | | |
| feet of clay | | | |
| fence-sit | | | |
| fetch and carry | | | |
| few and far between | | | |
| field day | | | |
| fifty-cent tour | | | |
| fighting chance | | | |
| fight shy | | | |
| fill one's boots | | | |
| fill someone's shoes | | | |
| filthy rich | | | |
| final say | | | |
| find it in one's heart | | | |
| find one's feet | | | |
| find the net | | | |
| fine line | | | |
| finger to the wind | | | |
| fire-breathing | | | |
| fire sale | | | |
| firm up | | | |
| first loser | | | |
| first-mover disadvantage | | | |
| first-rate | | | |
| fish-eating grin | | | |
| fish out of water | | | |
| fit for a king | | | |
| fit to wake the dead | | | |
| fix someone's wagon | | | |
| flannelled fool | | | |
| flash for cash | | | |
| flat strap | | | |
| flea in one's ear | | | |
| flip one's lid | | | |
| flip the bird | | | |
| flog the log | | | |
| floor one could eat off | | | |
| flutter in the dovecote | | | |
| fly by | | | |
| fly in the face of | | | |
| fly off | | | |
| fly out of the blocks | | | |
| fly the flag | | | |
| fold like a cheap suit | | | |
| fold up | | | |
| follow the money | | | |
| food baby | | | |
| fool away | | | |
| fool's paradise | | | |
| for a change | | | |
| for all the world | | | |
| force down someone's throat | | | |
| for chrissake | | | |
| for fear of | | | |
| for fuck's sake | | | |
| forgive and forget | | | |
| for good and all | | | |
| for heaven's sake | | | |
| fork off | | | |
| for once | | | |
| for one thing | | | |
| for shits and giggles | | | |
| for that matter | | | |
| for the chop | | | |
| for the love of | | | |
| for the plot | | | |
| Fort Knox | | | |
| forward-leaning | | | |
| foul up | | | |
| four-minute warning | | | |
| four score and seven years ago | | | |
| fourth wall | | | |
| fox's socks | | | |
| free ride | | | |
| freezing cold | | | |
| fresh-faced | | | |
| fresh out of | | | |
| friends in high places | | | |
| frig it | | | |
| from A to Z | | | |
| from central casting | | | |
| from home | | | |
| from pillar to post | | | |
| from the cradle to the grave | | | |
| from the get-go | | | |