Narrator said that "he swore his sister to secrecy" now what does it mean I heard of swear upon but I didn't understand that please explain.
I made her promise to keep the story secret. The promise was a serious and solemn promise, often made by invoking ***'s name (ie I swear to *** that I will not tell anyone about this).
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I made her promise to keep the story secret.
The promise was a serious and solemn promise, often made by invoking ***'s name (ie I swear to *** that I will not tell anyone about this).
It means he told her she must not tell anyone, or perhaps made her promise not to tell anyone.