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Entry 1 sense Webster, 1913

trial and error

· tri·al and er·ror · IPA
01 The method of discovering something desirable by trying many different things until one works; as, the traditional method of finding new dr…
  1. 1.
    The method of discovering something desirable by trying many different things until one works; as, the traditional method of finding new drugs is by trial and error.
    “And millions miss for one that hits.” — Swift.