своего преподавателя

one's own teacher

→ свой
phrase Rare #49,711
one's own teacher Accusative singular masculine form of свой преподаватель. Своего refers back to the subject of the sentence, so the phrase can mean “her own teacher,” “his own teacher,” or “their own teacher,” depending on context.
RU: Я встретил своего преподавателя после занятия.
EN: I met my teacher after class.