an accident waiting to happen
idiomPart ofaccident
an accident waiting to happen — idiom
1. a person or situation that is so unsafe or careless that something bad is almost
1.idiom
Definition
a person or situation that is so unsafe or careless that something bad is almost sure to occur soon.
Example
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.