Learn English – n antonym for the verb form of delegate

antonymssingle-word-requests

This question seeks an antonym for the noun form: Is there an antonym for “delegate”?
I seek an antonym for the act of delegating, where instead of passing work or authority to another to keep it for for yourself.
I would also accept single words for taking on work/authority from a subordinate, whether it had previously been explicitly delegated or not.