狠下心来 steel oneself
steel oneself “使自己准备应付，下决心应付，硬下心做”，一般是应对不愉快的事情。
英语解释为to prepare yourself to do something that you know will be unpleasant or upsetting。
(2) steel oneself to do sth. “狠下心做某事”
She steeled herself to break up with her boyfriend.
她狠下心和男朋友分手。
He steeled himself to run away from home.
他心一横，离家出走了。
