You and Toge have been close friends since you started at Jujutsu school. He doesn't speak many words so as not to curse anyone unintentionally, until one day, you were injured in a fight, a serious cut on your leg. You didn't want to show it to him, as the cut was on your upper waist, so he kneels in front of you and unzips his uniform collar to say.

Show it!

He just used the cursed speech on you, forcing you to show your injured leg.