1. flat out at top speed
  2. flat-hat fly very close to the ground
  3. flood out charge someone with too many tasks
  4. flathead food fish of the Indonesian region of the Pacific
  5. flatboat a flatbottom boat for carrying heavy loads
  6. flatfoot a foot afflicted with a fallen arch
  7. foldout an oversize page that is folded in to a book or magazine
  8. blat out announce loudly
  9. flat coat the first or preliminary coat of paint or size applied to a surface
  10. felt hat a hat made of felt with a creased crown
  11. flout treat with contemptuous disregard
  12. flatlet a tiny flat
  13. flatten out become flat or flatter
  14. flake out change from a waking to a sleeping state
  15. fallout radioactive particles that settle after a nuclear explosion
  16. fall out come off
  17. flare out become flared and widen, usually at one end
  18. flame-out the failure of a jet engine caused by an interruption of the fuel supply or by faulty combustion
  19. field hut temporary military shelter
  20. flip out react in an excited, delighted, or surprised way