to enrich the blood

比喻补充新物资或新成员to supplement something with new resources

• 要使它们摆脱停滞、萎缩的状态，重现生机，“补血”“加餐”势在必行。

  Must make them shake off a state of stagnation and atrophy and take action to revitalize themselves and add supplementary resources.

• 国安足球俱乐部为北京队“补血”投资比去年增。

  Guoan Football Club has injected more investment into the Beijing team this year than last year.