abrüsten
Meanings
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Vocab:
die Rüstung, rüsten, ausrüsten, aufrüsten, umrüsten, abrüsten, entrüstet, das Gerüst

Word Family
The core idea of this root was:
layering, covering
The German source that I am using (DWDS.de) suggests, that this root is the origin of words like crypt, encrypt and crypto, but the English etymological dictionary doesn’t mention this connection.