One's purchases are on the house; one will not be charged for one's purchases; said to insist on comping or treating a customer.
Said to refuse service to a customer.
1907 December, Jack London, “Hoboes That Pass In The Night”, in The Cosmopolitan[1], volume 44, number 2, page 193:
"Your money's no good here," he answered, shoving the two dimes across the bar to me. Sadly I dropped them back into my pocket, sadly we yearned toward the blessed stove and the armchairs, and sadly we went out into the frosty night.
