revolving door syndrome

bang down the door

To present oneself as a strong candidate for a role or achievement, explicitly or implicitly.

China syndrome

A hypothetical kind of catastrophic failure in which a nuclear reactor melts through the floor of its containment system and (if on land) penetrates the Earth's surface, continuing downward as if (from a Western Hemispheric point of view) traveling through the planet toward China.

close the stable door after the horse has bolted

To attempt to prevent a problem that has already occurred; to design and implement a preventive mechanism that is too late (after the first failure instead of before).

darken a church door

To go to church to attend a service.

darken someone's door

To arrive at someone's residence or location, especially as an unexpected visitor.

Derangement Syndrome

The acute onset of paranoia in otherwise normal and balanced people triggered by the mention of a specific topic.

don't let the door hit you on the way out

Used as a command to leave in haste, or to indicate that one is glad, or at least unmoved, to see the addressed person leaving.

floppy infant syndrome

Hypotonia.