血債要用血來償

A debt of blood must be paid in blood. / Blood calls for blood.

blood / colloquial pr. [xie3] / CL:滴[di1],片[pian4]

debt of blood (after killing sb)

debt / CL:筆|笔[bi3]

to demand / to request / to coerce

important / vital / to want / to ask for / will / going to (as future auxiliary) / may / must / (used in a comparison) must be / probably / if

(bound form) to demand; to coerce

to want; to need; to ask for / will; shall; about to / need to; should / if (same as 要是[yao4 shi5]) / (bound form) important

to use / to employ / to have to / to eat or drink / expense or outlay / usefulness / hence / therefore

to come / to arrive / to come round / ever since / next

to repay / to compensate for / to recompense / to fulfill (hopes etc)