Aminisha depending on the context is translated as:

• Aminisha (acha kitu au jambo chini ya mamlaka ya mtu) ni: entrust.
• Aminisha (thubutu au jasiri kufanya jambo la hatari) ni: empower, make someone brave.
• Aminisha (sadikisha mtu juu ya kitu au jambo fulani) ni: assure.

https://mhariri.com/kamusi/maana-ya-maneno/maana-ya-neno-aminisha-na-english-translation/