Past tense of discount; reduced in price, or dismissed as unlikely or unimportant.
From Old French 'desconter' meaning 'to deduct', from 'des-' (away) + 'conter' (to count). Originally a banking term for deducting interest in advance, it later expanded to general price reductions.
The phrase 'discount their opinion' comes from the original banking meaning - just as banks would 'discount' or reduce the value of future payments, we reduce the value we place on certain viewpoints!
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