kill the rabbit

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Before the days of instant pregnancy tests, a woman's sample was injected into a rabbit. There were several varieties of tests; one allegedly would kill the rabbit if the pregnancy hormone was present in the sample (most accounts indicate the rabbit was killed and dissected either way.)


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kill the rabbit

  1. (obsolete, idiomatic) To get a positive test result from an old-fashioned pregnancy test.
    "What about her?" "She killed the rabbit."