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Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs