reckon with

柯林斯词典

1. PHRASAL VERB If you say that you had not reckoned with something, you mean that you had not expected it and so were not prepared for it. 料想到[with brd-neg]
Gary had not reckoned with the strength of Sally's feelings for him. 加里没有料想到萨莉对他的感情如此强烈。
2. PHRASE If you say that there is someone or something to be reckoned with, you mean that they must be dealt with and it will be difficult. 认真处理; 小心对付
This act was a signal to his victim's friends that he was someone to be reckoned with. 这一举动是给为他所害者的朋友们的一个信号，告诉他们他是个必须被小心对付的人。