ingeminate \in-JEM-uh-neyt, verb:

To repeat; reiterate.

Sitting among his friends, often, after a deep silence and frequent sighs, he would with a shrill and sad accent ingeminate the word Peace, Peace…
— Christopher Ricks,Essays in Appreciation

Mr. Dott’s spirits were a little dashed, especially as Niven with a fateful countenance continued to ingeminate the word “Hungrygrain.”
— Arthur Train,Tutt and Mr. Tutt

Ingeminate comes from the Latin word ingemināre which meant “to repeat or redouble.”