stupid is as stupid doesとは 意味・読み方・使い方

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stupid is as stupid does

1. Stupid behaviour indicates stupidity.
   • 1882 Anthony Trollope: Orley Farm

     As long as a man can pay twenty shillings in the pound and a trifle over, what does it matter
     if all the judges in the land was to call him stupid?' said Snengkeld.
     "Stupid is as stupid does." said Kantwise.
     "Stupid be d--." said Moulder.
     "Mr. Moulder, there's ladies present." said Mrs. Smiley,