一いっ手てに

adverb

single-handedly; alone; by oneself

Emphasizes that one person does something without help, often taking on a task or responsibility entirely by themselves. Commonly used with verbs like 引き受ける, 背負う, or 担う.

• 彼かれはそのプロジェクトを一いっ手てに引ひき受うけた。

  He took on the project single-handedly.

• 母ははは家か事じを一いっ手てにこなしている。

  My mother handles all the housework by herself.