expression, noun
the coming days; every day that comes
Set phrase often used in expressions like 来る日も来る日も (day after day, every single day). Emphasizes the repetitive or continuous nature of days arriving.
来る日も来る日も雨ばかりだ。
Day after day, it's nothing but rain.
来る日も来る日も同じ作業の繰り返しだった。
Every single day was a repetition of the same task.