Katy Bar The Door
Meaning
Quickly lock the door before something unwanted gets in (or out).
Example
When the intranet police come to your office, it’s Katy bar the door.
Origin
From a book of poems called King’s Tragedy by D. G. Rossetti published in 1881. It tells of an attempt by one Catherine to save the life of Scotland’s James I by throwing her arm across a doorway to bar his enemies;
The phrase was further popularized in a 1980s Miller Lite Beer commercial featuring ex-baseball player Bob Eucker.
