if you fight, run or work like hell, you do it a lot or very quickly.

We heard the alarm and ran like hell.

• fool with something
• foot the bill
• for a change
• for a kick-off
• for all
• for all cares
• for all intents and purposes
• for all knows
• for all someone cares
• for all someone knows
• for all something
• for all that
• for all the world like
• for all the world like something
• for anything
• for anything in the world
• for a price
• for a song
• for better or for worse
• for better or worse
• forbidden fruit
• force hand
• force of habit
• for certain
• force someone's hand