up ‧ grade /ʌpˈɡreɪd/ BrE AmE verb
1 . [intransitive and transitive] to make a computer, machine, or piece of software better and able to do more things
upgrade (something) to something
You’ll need to upgrade your hard drive to 120Mb before running this software.
2 . [transitive] to improve something and make it more modern, especially in order to provide a better service:
The hotel has recently been refurbished and upgraded.
3 . [intransitive and transitive] to give someone a better seat on a plane or a better room in a hotel than the one they paid for
upgrade (somebody) to something
We can upgrade you to business class.
4 . [transitive] to give someone a more important job
5 . [transitive] to change the official description of something to make it seem better or more important OPP downgrade
upgrade something to something
Four of the regions were upgraded to the status of republic.
6 . upgrade your skills to learn new and more modern ways of doing a particular job
—upgrade /ˈʌpɡreɪd/ noun [countable]