an accident waiting to happen

成語所屬單字accident

an accident waiting to happen — 慣用語

1. a person or situation that is so unsafe or careless that something bad is almost

1.慣用語
釋義

遲早會出事的人或情況

a person or situation that is so unsafe or careless that something bad is almost sure to occur soon.

例句

That broken staircase in the old library is an accident waiting to happen.

The way Diego rides his motorbike without a helmet, he's an accident waiting to happen.