쌓이다

For several things to be put in layers.

For a structure to be made with materials like stones, wood, etc., put in layers.

For a basis or foundation to be established strongly.

For a lot of skills, experiences, knowledge, etc., to be acquired over a long time.

To come to gain a lot of wealth, honor, trust, etc.

For things to do, worries, fatigue, etc., to come at once or be overlapped.