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Phrase(s): serve as a guinea pig
Fig. [for someone] to be experimented on; to allow some sort of test to be performed on one. (Alludes to the use of guinea pigs for biological experiments.) • Try it on someone else! I don’t want to serve as a guinea pig! • Jane agreed to serve as a guinea pig. She’ll be the one to try out the new flavor of ice cream.
McGrawhill's American Idioms And Phrasal Verbs