deceive
/dɪˈsi:v; dɪ`siv/ v[Tn, Tn.pr]
1 ~ sb/oneself (into doing sth) make sb believe sth that is not true (so as to make him do sth); deliberately mislead sb 欺骗某人（去做某事）; 使自己信以为真（去做某事）; 故意使（某人）误解
You can't pass exams without working, so don't deceive yourself (into thinking you can). 不努力是考不及格的, 因此不要欺骗自己（以为可以及格）.
We were deceived into believing that he could help us. 我们受骗了, 还以为他能帮助我们.
His friendly manner did not deceive us for long. 他那热情的样子并没把我们欺骗多久.
2 ~ sb (with sb) be sexually unfaithful to (one's spouse, etc) （指性行为）对（配偶等）不忠
He's been deceiving his wife with another woman for months. 他几个月来一直瞒著妻子与另一女人来往.