What it means

1. noun the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components)
   “the power plant received a new upgrade”
2. noun hardware that provides better performance than an earlier version did
3. noun the property possessed by a slope or surface that rises
4. noun a reservation that is improved
   “I got an upgrade to first class when coach class was full”
5. noun software that provides better performance than an earlier version did
6. noun an upward slope or grade (as in a road)
   “the car couldn't make it up the rise”
7. verb to improve what was old or outdated
   “I've upgraded my computer so I can run better software”
8. verb give better travel conditions to
   “The airline upgraded me when I arrived late and Coach Class was full”
9. verb get better travel conditions
   “I upgraded to First Class when Coach Class was overbooked”
10. verb rate higher
11. verb give a promotion to or assign to a higher position
    “John was kicked upstairs when a replacement was hired”