释义
used in accounts and lists to indicate that an item is repeated (often indicated by ditto marks under the word or figure to be repeated)
同上，同前（常在被重复的词或数字下用“,,”表示）。
〈非正式〉 同样地
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if one folds his arms, so does the other; if one crosses his legs, ditto .如果一人双臂交叉，另一人也是；如果一人两腿交叉，另一人也同样。
词源
"early 17th cent． （in the sense ‘in the aforesaid month’）： from Tuscan dialect, variant of Italian