power (something) up
phrasal verb with power verb uk/paʊər/ us/ˈpaʊ.ɚ/
（使）启动；（使）积蓄能量；（使）养精蓄锐
If something that needs power or energy powers up, or if someone powers it up, it is turned on or prepared so that it is ready for use or action.
The computer takes a few seconds to power up after it's been switched on. 计算机开机后需要几秒钟的启动时间。
College baseball teams across the country are powering up for the new season. 全国各大学棒球队正在为新赛季积极备战。