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./