The initial idioms of the letter F

father	fathom the depths of (something)
fat	fatso
fatten the kitty	fatten up
fatten	fatty
fattygews	fault
faulty	faunch around
Little Lord Fauntleroy	Faustian bargain
faut	faux
faux pas	faux queen
favor	favor with
favorite	favorite son
favour	favourite
favourite son	play favourites
fawn on	fawn over
fawn	junk fax