n. & v.
n. (pl. -os) 1 (in accounts, inventories, lists, etc.) the aforesaid, the same. °Often represented by '' under the word or sum to be repeated. 2 colloq. (replacing a word or phrase to avoid repetition) the same (came in late last night and ditto the night before). 3 a similar thing; a duplicate.
v.tr. (-oes, -oed) repeat (another's action or words). ditto marks inverted commas etc. representing 'ditto'. say ditto to colloq. agree with; endorse.
[ It. dial. f. L dictus past part. of dicere say ]