etymology - How did 'sanction' come to have two opposite meanings?


Sanction is an unusual ambiguous word to me. In some cases it means to approve some action, while in other cases it means to prohibit or punish some action; and there being near opposite meanings, context is especially essential for correct interpretation.


What is interesting to me is: historically, how did sanction come to capture two opposite meanings like this? The etymology seems to trace back to the single Latin word sanctio, meaning a decree. But did sanctio have strong opposing meanings or connotations like our modern word sanction? Or how and when did the divergence occur over time?




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