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are double-checking

  • present progressive
    of double-check.
    double check
    noun
    a simultaneous check by two pieces in which the moving of one piece to give check also results in discovering a check by another piece.

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McKinley adds that concurrent studies in animals are double-checking the effect’s mechanism, and he is also preparing to submit research on vagus nerve stimulation to boost learning rates and retention.

From Scientific American ● Jun. 10, 2021