See: from the sublime to the ridiculous

• fit something on the back of a postage stamp
• fit the bill
• fit to drop
• fit you like a glove
• fix someone up
• fix someone up with
• fix someone up with someone
• fix someone up with something
• fix up
• fix up with
• fix up with someone
• fix up with something
• fizzle out
• flag down
• flag down someone
• flag down something
• flare up
• flash in the pan
• flat out
• Flattery will get nowhere.
• Flattery will get you nowhere.
• flavor of the month
• flavour of the month
• flesh and blood
• flesh out