Many thanks for your helpful reply which worked perfectly. This will certainly encourage me to refer to moodle.org more often from now on, rather than battle on alone.
Basically, why we did it is because the moodle support people hadn't used glossary much and didn't realise that the teacher wouldn't want students to see her comments to other students. The moodle support guys approved the entries, and then the teacher didn't like it.
Glossary
Can entries be unapproved after being approved?
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