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English definition of “there's no such thing as a free lunch”

there's no such thing as a free lunch

saying
said to emphasize that you cannot get something for nothing: "I get to travel with my job but the downside is I have to give talks." "Well, there's no such thing as a free lunch."
(Definition of there's no such thing as a free lunch from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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