Tah-
dee-woe
An unbreakable promise, one ensuring absolute
truth. The validity of the promise is kept by mutual trust between two parties. One keeps a tadewo mainly in hopes that, in the future, the other
party will keep it as well.
For example, Charlie makes Elliott tadewo that he Elliott will pay him Charlie back. Elliott keeps this promise to ensure that Charlie will stay faithful whenever he promises something through a tadewo in the future.