Idioms
Eyes bigger than your stomach
eat more food than one can handle
Fall foul of
quarreling
Feather brain
a silly or absent-minded person
Feet of clay
hidden fault
❝ I know it's hard to believe, but anyone you admire surely has feet of clay ❞
Fiddle while Rome burns
concerned with trivial matters while ignoring the serious or disastrous events
Field day
an enjoyable day or circumstance
Fire and brimstone
to punish
Fit as a fiddle
in very good health
Fly into a passion
to become angry suddenly
Foam in the mouth
be very angry
Fool's paradise
a state of happiness based on a person's ignorance about potential trouble
For a song
very cheaply
For good
forever; definitively
For keeps
forever
Forty winks
take a short nap
Fuddy duddy
an old-fashioned and pompous person
Gain ground
become more popular or accepted
Gall and wormwood
hateful
Get down to brass tacks
start to consider the basic facts or practical details
Get one's feet wet
begin to participate in an activity