A manservant; a male servant or attendant. An archaic term, sometimes used figuratively to mean someone who is subservient.
彼は貴族の下僕として若い頃から仕えていた。
He served as a manservant for a noble since his youth.
冗談で『私は猫の下僕だ』と言って、飼い主に従っている様子を表した。
Jokingly saying 'I'm the cat's manservant,' he expressed how obedient he is to his pet.