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big (of someone)

generous; kind or forgiving. (Sometimes sarcastic.) He gave me some of his apple. That was very big of him. It was big of Sally to come over and apologize like that.
References in classic literature ?
Then inch by inch out of the grass rose up the head and spread hood of Nag, the big black cobra, and he was five feet long from tongue to tail.
So he sent a boy to Big Klaus to borrow a bushel measure from him.
I shall return and attempt to lead the Big Bwana to the west.
Hercules very soon perceived that his troublesome enemy was growing weaker, both because he struggled and kicked with less violence, and because the thunder of his big voice subsided into a grumble.
While among these Indians, Captain Bonneville unexpectedly found an owner for the horse which he had purchased from a Root Digger at the Big Wyer.
Dan peered down into the water alongside, and flourished the big "muckle," ready for all chances.
From the remotest period of antiquity to which the archives have reference, the hours have been regularly struck by the big bell.
The woman went down, and found all three in the midst of their lamentations, and inquired what was the cause; then Elsie told her also that her future child was to be killed by the pick-axe, when it grew big and had to draw beer, and the pick-axe fell down.
The big man made no further remark, but I heard him mutter "fortunate" into his beard.
Next we come to the Hump, which is the part of the Broad Walk where all the big races are run, and even though you had no intention of running you do run when you come to the Hump, it is such a fascinating, slide-down kind of place.
Big green eyes had been painted upon it, but in the center of the chin were two small holes made in the pasteboard, so that the Chief could see through them with his own tiny eyes; for when the big head was fastened upon his shoulders the eyes in his own natural head were on a level with the false chin.
S'pose you like 'm, me take 'm one fella pound along you in big book.
You know that big flat jest below the Klondike and under Moosehide Mountain?
Suppose 'm no fella Su'u boy, my word, big trouble.
Further, no man violated the fish laws more systematically and deliberately than Big Alec.