Idiom 183: make up one's mind

많이 사용하는 표현이죠. 결심하다라는 뜻이구요..

make up one's mind = decide

She hasn't made up her mind as to what university she will be attending.

Idiom 182: in the bag

확실시 되는 상황을 가리킬 때 쓰는 표현입니다.

in the bag = certain = sure = definite

The job interview went very well and I think I will be hired. I am confident that it's in the bag.