The same thing again; a way of saying you agree with what someone just said or to avoid repeating the same words.
From Italian 'ditto,' the past participle of 'dire' meaning 'to say.' Italian merchants used it as shorthand in ledgers, and English borrowed it in the 1600s as a convenient way to mark repetitions.
Before texting and emojis, people used 'ditto' marks (little quotation marks) in documents to save writing time—it's basically the ancient shorthand for 'same!'
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