Belgium
blocus
Meaning
the study leave before university exams
Elsewhere
révisions
Explanation
Being shut away with your books before exams gets a rather martial name in Belgium, blocus, the word for a siege. Standard French just calls it les révisions.
Example
Je suis en blocus à partir de samedi, impossible de sortir avant les examens.
I'm in study leave from Saturday, no going out before the exams.
Origin
From the Middle Dutch blochuus, a small fort. The sense slid from the fort to the siege, then to any blockade.
Source