To spoil something that is good or something that you have, by being greedy. A proverb. Mrs. Jones gives you an apple from her tree whenever you go by her house, but don't kill the goose that laid the golden egg by bothering her too much.
KILL THE GOOSE THAT LAID THE GOLDEN EGG
Meaning of KILL THE GOOSE THAT LAID THE GOLDEN EGG in English
American idioms English vocabulary. Английский словарь американских идиом. 2012