1. drop back to lag or linger behind
  2. drawback a feature that makes something less convenient or acceptable
  3. draw back pull or move away
  4. drop-kick drop and kick as it touches the ground, as for a field goal
  5. dropkick (football) kicking (as for a field goal) in which the football is dropped and kicked as it touches the ground
  6. throw back throw back with a quick, light motion
  7. throwback a reappearance of an earlier characteristic
  8. drive back force or drive back
  9. drop arch a blunt pointed arch drawn from two centers within the span
  10. trim back cut down on; make a reduction in
  11. drop by visit informally and spontaneously
  12. trap block (American football) an illegal block
  13. dropping coming down freely under the influence of gravity
  14. turn back go back to a previous state
  15. drop open open involuntarily
  16. tropic either of two parallels of latitude about 23.5 degrees to the north and south of the equator representing the points farthest north and south at which the sun can shine directly overhead and constituting the boundaries of the Torrid Zone or tropics
  17. drip pan pan for catching drippings under roasting meat
  18. rollback reducing prices back to some earlier level
  19. tropopause the region of discontinuity between the troposphere and the stratosphere
  20. crookback a person whose back is hunched because of abnormal curvature of the upper spine