下狠心

to resolve (to do sth); to toughen up

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

ruthless / fierce / ferocious / determined / to harden (one's heart) / old variant of 很[hen3]

callous / heartless

callous; heartless / to resolve (to do sth) / firm resolve (as in 下狠心[xia4 hen3 xin1])

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]