毎まい日にち毎まい日にち

adverb, noun which may take the genitive case particle 'no'

day after day; every single day

Emphasizes the repetitive, continuous nature of an action or state happening daily, often with a nuance of monotony or persistence.

• 毎まい日にち毎まい日にち、同おなじことの繰くり返かえしだ。

  Day after day, it's the same thing over and over.

• 毎まい日にち毎まい日にちの勉べん強きょうが実みを結むすんだ。

  The daily, day-after-day studying paid off.