understandingA grammatical phrase meaning “understanding [something]” or “that understands [something].” 을 marks the object of 이해하다, and 는 turns the verb into a modifier or noun-like phrase. The object can be replaced with a noun or pronoun.
KO: 어려운 개념을 이해하는 데 시간이 걸려요.
EN: It takes time to understand difficult concepts.