expression
one's daily conduct; one's habitual behavior
Refers to a person's everyday actions and behavior, often used when discussing how one's usual conduct influences outcomes like luck or misfortune.
日頃の行いが悪いと、いざというときに助けてもらえないよ。
If your daily conduct is bad, no one will help you when you really need it.
試験に落ちたのは日頃の行いが悪かったからかもしれない。
Maybe I failed the exam because of my poor daily behavior.
A set phrase combining 日頃 (daily, usual) and 行い (conduct, behavior). The exact origin is uncertain, but it reflects a common cultural idea that one's everyday actions shape one's fate.