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. 加裡沒有料想到薩莉對他的感情如此強烈。
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. 認真処理; 小心對付
This act was a signal to his victim's friends that he was someone to be reckoned with. 這一擧動是給爲他所害者的朋友們的一個信號，告訴他們他是個必須被小心對付的人。