게 아주

… very

→ 것+이
phrase Rare #32,395
… very 게 can mean “thing” or nominalize a preceding clause; 아주 means “very.” Together, they are not a fixed expression, and the English translation depends on the surrounding sentence.
KO: 네가 만든 게 아주 예뻐.
EN: The thing you made is very pretty.

고백할 게 아주 많소

I have a great deal to confess.

— 마농의 샘 2부 (1986)