put all one's eggs in one basket
put all one's eggs in one basket {v. phr.}
To place all your efforts, interests, or hopes in a single person or thing.
Going steady in high school is putting all your eggs in one basket too soon.
To buy stock in a single company is to put all your eggs in one basket.
He has decided to specialize in lathe work, although he knows it is risky to put all his eggs in one basket.
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Source: A Dictionary of American Idioms
