From native Korean roots: 가르- (to divide/separate, as in distinguishing or sorting knowledge) + -치다 (a causative/intensive verbal suffix). The "dividing" sense captures the idea of breaking knowledge down and passing it on — a teacher sorts and parcels out what they know.

In Korean culture, teachers (선생님, seonsaengnim) are held in especially high social regard, influenced by Confucian values that place scholars and educators near the top of the social hierarchy. The word 선생님 literally means "one born before" — implying wisdom from experience. Be careful not to confuse 가르치다 (to teach) with the similar-sounding 가리키다 (to point at/indicate) — a very common mix-up for learners.