defection
de·fec·tion
noun
1.
withdrawing support or help despite allegiance or responsibility
- “his abandonment of his wife and children left them penniless”
Origin
From Latin dēfectiō (stem dēfectiōn-).
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.