- first string
- first-class
- fish curing
- flung
- fix someone up
- flagrant
- flagstone
- flair
- flake
- flame
- flame of burning hay-stack
- flatmate
- flautist
- flavian
- flawless
- frowzy
- flick through
- flight simulator
- fling or sling mud
- flip flopper
- fluoride
- flurried
- fluted
- fluxionary
- fly go out of the window
- fly into rage
- fly of the handle
- fly-fishing
- foible
- folder
- foliage
- foolish fellow
- foot movement
- foot stone
- football pool
- foray
- forbearing
- formic
- formica compressa
- fornication
- forswear
- forte
- foyer
- fractious
- fragile
- frail
- frame-up
- frantic
- fratricide
- freely
- fresh butter
- fresh-water snail
- freshman, freshwoman
- friction
- friendless
- front
- frosty
- full-bodied
- fuller's earth
- fully
- fully drawn
- furious
- furnace
- furthest
- from top to bottom
- fabric
- faction
- fall
- fall back on
- falsehood
- fan
- far and away
- farm something out
- far out
- fatigue
- fashionable
- fastidious
- faulty
- fearless
- feel for
- fell
- figment
- filigree
- firebrand
- fish someone out, fish something out
- fit
- fission
- flag
- fleece
- flounce
- flotsam
- flout
- follow something up
- fondle
- fool around
- foreword
- forfeit
- fresh
- furry
- future