괴오다

Etymology
Has the shape of *괴다 +, but no such relevant verb is attested.

Verb

 * 1) to support, to prop up

Usage notes
Another verb with the form 괴오다, a derived causative of with the sense of "to cause to pool together", is attested in  Early Modern Korean (諺解痘瘡集要/언해두창집요, 1608).