Cracks

The issue fell between the cracks.

Mistreated illegal foreign workers often fall between the cracks of the social system.

Treated roughly, the cup has some cracks.

In severe cases, cracks can form or it can snap apart.

Also cracks may form in buildings that aren't Earthquake proof.

The coalition is trying to paper over the cracks.

Tom doesn't like it when Mary cracks her knuckles.

I guess I fell through the cracks.

That means that water flows over the plaster and enters cracks easily.

He went slowly and deliberately to his car, being careful not to step on the cracks in the cement walkway.