Flat, a raw, an inexperienced fellow, a fool
Flat-catcher, an article to dupe the public
Fleec’d, clean’d out, stript
Flick, to cut
Flicker, a drinking glass
Flimsies, Bank of England notes
Flipper, the hand
Floating academy, the hulks at Woolwich for convicts
Flogger, a whip
Floored, knocked down