give better travel conditions to; "The airline upgraded me when I arrived late and Coach Class was full"
get better travel conditions; "I upgraded to First Class when Coach Class was overbooked"
rate higher; raise in value or esteem
give a promotion to or assign to a higher position; "John was kicked upstairs when a replacement was hired"; "Women tend not to advance in the major law firms"; "I got promoted after many years of hard work"
to improve what was old or outdated; "I've upgraded my computer so I can run better software"; "The company upgraded their personnel"