/ ˈdɪtəʊ; NAmE -toʊ/ noun , adverb
■ noun
( abbr. do. ) ( symb 〃 ) used, especially in a list, underneath a particular word or phrase, to show that it is repeated and to avoid having to write it again
■ adverb
( informal ) used instead of a particular word or phrase, to avoid repeating it :
The waiters were rude and unhelpful, the manager ditto.
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WORD ORIGIN
early 17th cent. (in the sense in the aforesaid month ): from Tuscan dialect , variant of Italian detto said, from Latin dictus said.