To advise against; to discourage or dissuade someone from a course of action.
From dis- (prefix meaning 'against' or 'opposite of') + counsel (to give advice, from Latin consiliare). Together they mean to advise against something.
This is an archaic verb—Shakespeare and other historical writers used 'discounsel' to mean giving bad advice or warning someone away, but modern English just uses 'discourage' or 'advise against' instead!
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