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

to give up, resign, surrender

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

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

the practice of brushing up a skill

to brush up (a skill, knowledge, etc.) / to review or improve (something)

(video game development) completion of development

(video game development) to complete development

upgrade

to upgrade