What is the denotative meaning of heard it from the grapevine? You heard something outdoors.
A grapevine told you something.
You heard a rumor from somebody.
You missed out on hearing something.

What is implied in this sentence from mark twain's "the £1,000,000 bank-note"? i was puzzled, and wanted to discuss the matter a little further, but they didn't; so i took my leave, feeling hurt and insulted to be made the butt of what was apparently some kind of a practical joke, and yet obliged to put up with it, not being in circumstances to resent affronts from rich and strong folk.