This is the 4183rd most frequent Korean word.
주신
"주신" means "given" or "bestowed" and is derived from the verb 주다 (to give) in honorific form.
In this sentence, '주신' refers to the action of giving performed by the subject (my mother), indicating respect and the completion of the action.
어머니께서 주신 선물이 정말 마음에 들어요.
The gift my mother gave me is really dear to me.
Here, '주신다면' is used conditionally to express the act of giving time, showing politeness and a hypothetical scenario.
저에게 시간을 주신다면 설명해드리겠습니다.
If you give me some time, I will explain it to you.
'주신' in this sentence indicates respect towards the teacher while describing the act of giving assignments.