put all eggs in one basket
put all (one's) eggs in one basket
To invest, devote, or commit all of one's energy or resources into a single venture, opportunity, or goal, generally at the risk of losing everything in the event that that thing fails or does not come to fruition. She has all her eggs in one basket with this merger deal. If it doesn't work out, I doubt her company can survive. I applied to several colleges so I wasn't putting all my eggs in one basket.
put all one's eggs in one basket
Fig. to make everything dependent on only one thing; to place all one's resources in one place, account, etc. (If the basket is dropped, all is lost.) Don't invest all your money in one company. Never put all your eggs in one basket. I advise you to diversify and not to put all your eggs in one basket.