Formal:
* Aaʼpiikssini (pronounced ah-pee-ksini): This is the most formal way to say goodbye. It literally means "I will see you again."
Informal:
* Aʼaʼpsi (pronounced ah-ah-psi): A shortened version of "Aaʼpiikssini", also meaning "I will see you again."
* Niʼpiʼtsii (pronounced ni-pi-tsi): This is a more casual goodbye, meaning "See you later."
More specific:
* Miitsʼiistootosi (pronounced miit-si-stoo-tosi): This means "Goodbye, I love you."
* Kitakssini (pronounced ki-tak-ssini): This means "Take care."
It's important to note that Blackfoot is a vibrant language with regional dialects, so pronunciations and usage can vary. It's always best to ask a fluent speaker for the most appropriate phrase in a specific situation.