This is the 132nd most frequent Korean word.
두고
"두고" means "leaving" or "placing (something somewhere)."
In this sentence, "두고" from "두다" is used to mean "to leave something somewhere temporarily." Here, it indicates the act of placing or leaving the bag on the table.
그는 가방을 탁자 위에 두고 떠났어요.
He left, leaving his bag on the table.
The phrase "두고 보다" literally translates to "leave and see," which is an idiomatic expression to mean 'wait and see.' "두고" works as part of this phrase.
나는 그를 믿고 두고 보려고 해요.
I will wait and see, trusting him.
Here, "두고 두고" implies something that is done repeatedly over a long period, utilizing "두고" to express persisting or continuous action.