The initial idioms of the letter F

form an opinion	form and substance
form from	form into
form out of	form up
dispense with (the) formalities	former
fort	forth
forty	fortify
fortune	fortune favors the bold
Fortune favors the brave	fortune is smiling (up)on (someone)
fortune smiles (up)on someone	Forty acres and a mule
forty winks	forward
forwards	fosho
fossil	foul ball
foul mouth	foul one's nest
foul out	foul own nest
foul play	foul up