To stop doing something or stop producing something.
From Latin 'dis-' (away, apart) plus 'continuus' (continuous, uninterrupted). The word was formed in the 1400s by combining these parts to mean literally 'break continuity' or cease an ongoing action.
Companies use 'discontinue' as a polite way to say 'we're killing this product forever,' but it's interesting that the word contains 'continue'—the opposite of what it means—which is why adding 'dis-' changes so many English words into their opposites (disagree, disobey, disarm).
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