guinea pig
US /ˈɡɪn.i ˌpɪɡ/
UK /ˈɡɪn.i ˌpɪɡ/
1.
a small, tailless, domesticated South American rodent with short ears and a stout body, widely kept as a pet or for scientific research.
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My sister got a new guinea pig for her birthday.
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The scientist used guinea pigs in their experiment.
2.
a person or thing used as a subject for experiment, trial, or practice.
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The new software was tested on a few users, who acted as guinea pigs.
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I don't want to be a guinea pig for their experimental new diet.