https://www.amren.com/archives/back-issues/february-2009/

But, he assured me, it was otherwise for “promise.” I was skeptical. How about “obligation?” We both had the same dictionary (English-Zulu, Zulu-English Dictionary, published by Witwatersrand University Press in 1958), and looked it up. The Zulu entry means “as if to bind one’s feet.” He said that was not indigenous but was added by the compilers. But if Zulu didn’t have the concept of obligation, how could it have the concept of a promise, since a promise is simply the oral undertaking of an obligation? I was interested in this, I said, because Africans often failed to keep promises and never apologized — as if this didn’t warrant an apology.

A light bulb seemed to go on in his mind. Yes, he said; in fact, the Zulu word for promise — isithembiso — is not the correct word. When a black person “promises” he means “maybe I will and maybe I won’t.” But, I said, this makes nonsense of promising, the very purpose of which is to bind one to a course of action. When one is not sure he can do something he may say, “I will try but I can’t promise.” He said he’d heard whites say that and had never understood it till now. As a young Romanian friend so aptly summed it up, when a black person “promises” he means “I’ll try.”

Make of it what you will. CPT is a real thing, though.