expression
day after day; every single day
Emphasizes the repetitive, unchanging nature of daily events, often with a sense of monotony or persistence.
来る日も来る日も雨が降り続いた。
It rained day after day without stopping.
彼は来る日も来る日も同じ仕事を繰り返している。
He repeats the same work day in and day out.