also: にじゅうでま
noun
double work; duplication of effort
Refers to doing the same work twice or having to redo something, often due to poor planning or inefficiency. Used in business and everyday contexts.
データを手入力するのは二重手間だ。
Entering the data by hand is double work.
書類を紙と電子の両方で管理するのは二重手間になる。
Managing documents both on paper and electronically results in duplication of effort.
Compound of 二重 (ふたえ, 'double') and 手間 (てま, 'effort, trouble'). The reading にじゅうでま uses the alternative reading にじゅう for 二重.