noun
a reworking or restatement of already known information
verb
to rework or repeat old material
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The academic journal decided to rehash the previous research findings in their latest publication.
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I don't want to rehash our argument from yesterday, let's just move on.
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Stop rehashing the same old drama, it's getting annoying.
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The politician tried to rehash his old promises in a new speech, but nobody was convinced.