| 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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