noun
worrying about one's master; devoted servant
Refers to a servant's deep concern for their master's well-being or affairs; can also denote the person who feels such devotion. Archaic flavor, associated with feudal loyalty.
あの家来は主思いが深く、常に殿の健康を気遣っていた。
That retainer was deeply devoted to his master, always worrying about his lord's health.
主思いの忠臣は、主君の危機を救うために命をかけた。
The loyal retainer, ever concerned for his master, risked his life to save his lord from danger.