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Adjective: on the button
Usage: informal
  1. Being precise with regard to a prescribed or specified criterion
    "the prediction for snow was right on the button";
    - on the nose [informal]
Adverb: on the button
Usage: informal
  1. Just as it should be
    "'on the button, my lord,' he said";
    - precisely, exactly, on the nose [informal], on the dot [informal]

See also: precise