fail

It looks likely that the peace talks will fail..看来和平谈判可能会失败。

Millions of people have tried to quit smoking and failed miserably (= been completely unsuccessful )..数百万人戒过烟，都以惨败告终。

his efforts to save his failing marriage.他挽救自己濒危婚姻的努力

If all else fails, you may be advised to have an operation..要是其他方法都不见效的话，恐怕你还是动手术的好。

fail in,失败；缺少

without fail,务必；必定，无疑

never fail to,一定会...

fail to do,失败；未做成

fail safe,故障保护；失效安全

fail to resolve,解决未果

words fail me,说不出话来