三みっ日か坊ぼう主ず

Usage patterns

• 〈事こと〉が三みっ日か坊ぼう主ずに終おわるfor something (a habit, plan, etc.) to fizzle out after just a few days

  今年ことしこそ毎まい日にち運うん動どうしようと思おもったが、また三みっ日か坊ぼう主ずに終おわった。

  I meant to exercise every day this year, but I gave up after just three days again.

• 〈事こと〉を三みっ日か坊ぼう主ずで終おわらせるto let something fizzle out after only a few days (causative, self-critical)

  せっかく始はじめた日にっ記きを三みっ日か坊ぼう主ずで終おわらせてしまった。