cannot afford idiom (formal can ill afford)
C2 承担不起（损失、后果等）
If you cannot afford to do something, you must not do it because it would cause serious problems for you.
We can't afford to make any mistakes at this stage in the project. 工程进行到这个阶段，犯任何错误我们都承担不起后果。
He can ill afford to fail any of his exams. 任何一门考试不通过，他都担负不起。