| flap one's gums | | | |
| flat on one's back | | | |
| flatten out | | | |
| flight of fancy | | | |
| flip one's wig | | | |
| flog a dead pony | | | |
| flood the zone | | | |
| flunk out | | | |
| flutter the dovecote | | | |
| flying start | | | |
| fly in the ointment | | | |
| fly off the shelves | | | |
| fly out of the traps | | | |
| fog a mirror | | | |
| fold one's tent | | | |
| follow suit | | | |
| follow through | | | |
| food noise | | | |
| fool's bargain | | | |
| foot the bill | | | |
| for a fact | | | |
| for beans | | | |
| force of habit | | | |
| for England | | | |
| for fear that | | | |
| forget to take one's medication this morning | | | |
| forgive but don't forget | | | |
| for goodness' sakes | | | |
| forked tongue | | | |
| for my money | | | |
| for one's life | | | |
| for real and for true | | | |
| for shits and grins | | | |
| for the birds | | | |
| for the fuck of it | | | |
| for the most part | | | |
| for the time being | | | |
| forty minutes of hell | | | |
| for XYZ reasons | | | |
| Four Horsemen of the Apocalypse | | | |
| four-on-the-floor | | | |
| fourth gear | | | |
| fox in the henhouse | | | |
| free hand | | | |
| freeze | | | |
| frequent flyer | | | |
| fresh legs | | | |
| friend of Bill W. | | | |
| friends in low places | | | |
| from a mile away | | | |
| from away | | | |
| from dusk to dawn | | | |
| from hunger | | | |
| from stem to stern | | | |
| from the Department of the Bleeding Obvious | | | |
| from the gecko | | | |
| from the ground up | | | |
| from the word go | | | |
| from womb to tomb | | | |
| front of mind | | | |
| frown at | | | |
| fruit of the poisonous tree | | | |
| fruit up | | | |
| fucked by the fickle finger of fate | | | |
| fucked over | | | |
| fucking hell | | | |
| fuck it | | | |
| fuck off | | | |
| fuck someone upside down | | | |
| fuck this | | | |
| fuck y'all | | | |
| fudge factor | | | |
| full blast | | | |
| full circle | | | |
| full marks | | | |
| full of hot air | | | |
| full of oneself | | | |
| full ride | | | |
| full-stretch | | | |
| full tilt boogie | | | |
| full to the gills | | | |
| fully rigged | | | |
| funny bone | | | |
| funny man | | | |
| fur-flying | | | |
| face down | | | |
| faceless man | | | |
| face the music | | | |
| factor space | | | |
| fail at life | | | |
| fair enough | | | |
| fair sex | | | |
| fair-weather friend | | | |
| fall around | | | |
| fall between two stools | | | |
| fall foul | | | |
| fall into a trap | | | |
| fall into the wrong hands | | | |
| fall off the back of a truck | | | |
| fall on a grenade | | | |
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