disempower

Short definition from Wiktionary

Verb

1. 1
   To strip power from (someone or some group), as: To remove morale or self-confidence from (someone or some group) to do something.
2. 2
   To strip power from (someone or some group), as: To remove authority or (official) confidence from (someone or some group) to do something (such as administer a state function), as by demoting, disestablishing, or unincorporating a group.