setback

noun7

1. •
   An obstacle, delay, disadvantage, or blow (an adverse event which slows down, or prevents progress towards a desired outcome).

   • After some initial setbacks, the expedition went safely on its way.
2. •
   Any adverse event, defeat, or impediment of progress.
3. •
   A backset; a check; a repulse; a relapse.
4. •
   (US) The required distance between a structure and a road.
5. •
   A step-like recession in a wall.

   • Setbacks were initially used for structural reasons, but now are often mandated by land use codes.
6. •
   An offset to the temperature setting of a thermostat to cover a period when more or less heating is required than usual.

   • Fuel savings from thermostat setbacks have long been accepted as fact, but little documentation existed to support it. — 1980
7. •
   (no longer used) A backset; a countercurrent; an eddy.