Phrasal verbs are an important feature of the English language. The meaning of a phrasal verb often bears no relation to the meaning of either the verb or the particle which is used with it. Many phrasal verbs have several different meanings.
Flag down (to make a vehicle stop by waving at the driver)
We tried to flag down a taxi to reach my hotel.
Flake out (to suddenly feel asleep because you are tired)
After an exhausting day the boys flaked out on their beds.
Flare up (if violence flares up, it suddenly happens and becomes very serious)
Violence flared up in Afghanistan after the American troop withdrawal.
Flash around (to show something valuable to others in order to make them feel jealous of you)
I saw Diana flashing around her gold necklace.
Flashback ((a scene in a film which shows something that happened in the past)
The film began with a flashback to the hero’s schooldays.
Flash out (to suddenly express a strong emotion)
Bob’s eyes flashed out a look of hatred.
Flatten out (to make something become flat)
Roy flattened out the Sunday Observer and began to read it.
Flesh out (to add more details to a piece of writing)
You need to flesh out your essay with more facts.
Flick through (to look briefly at the pages of a book)
Before buying a copy of the book I flicked through the pages to see whether it is worth the price.
Fling into (to spend a lot of time and energy to do something)
Sharon flung herself into work on the first day itself.
Fling off (to remove something quickly)
Barbara began to fling off her clothes after returning home.
Flip through (to look briefly at the pages of a book)
Norma flipped through the pages of a fashion magazine.
Flirt with (to be interested in something for a short period of time)
After leaving school Ron flirted briefly with communism.
Float about (to repeat a story by a lot of people)
Rumours about the health condition of a leading businessman are floating about these days.
Flood back (to remember something that happened in the past)
Whenever I see a school, memories of my own school days keep flooding back.