Shitsuji Shoujo to Ojou-sama - Vol. 2 Ch. 13 - A Pro Butler Can't Lose!

[MangaDex]

 

[alfirizkyr]

Idk who'll need this in the future, but 下剋上 gekokujou is a word that refers to someone of lower station who acts or is deemed to be above someone of higher station. It could mean something like a retainer supplanting his lord, or something like a junior who dominates their senior.

Or, in this context, a butler who made their master submit.