ㄧㄤˇㄐㄧㄥㄒㄩˋㄖㄨㄟˋyǎngjīng‑xùruì

养精蓄锐
  1. 保養身體積蓄精力 假期養精蓄銳準備迎接任務」。

to preserve and nurture one's spirit (idiom)​; honing one's strength for the big push