Rising to a higher level or standard; improvement. / (role-playing games, video games) levelling up

To rise to a higher level or standard; to improve. / (role-playing games, video games, intransitive) to level up

(chiefly fiction, especially video games) upgrade; enhancement

(chiefly fiction, especially video games) to get upgraded; to get enhanced

a pop-up

to give up, resign, surrender

resignation, surrender / (sports, games) loss by resignation or withdrawal

(business) to start up, to found (a business); to spin off / (computing, rare) to start up (launch)

(business) startup (company) / (business) starting up (the process of founding (a business)) / (computing, rare) starting up (launching)

the practice of brushing up a skill