Glossary
What does hold short mean?
An instruction to stop before a marked line and not cross it, most often at the edge of a runway. Crossing a hold short line without the clearance to do so is a runway incursion, and it is reportable.
Also called Hold short line
That is the whole entry for now. The longer version, with the mechanics and worked examples, is still to be written. See autorotation for how those read once they exist.