kumiaわせるwaseru
1.

To bring together two or more separate elements into a unified whole or set that functions as one unit.

2.

To determine a specific pairing or matchup for competition or a contest.

3.

To link distinct components or items in a way that forms a cohesive connection or relationship.

Example:

この上着を何か少し派手な物と組み合わせられませんか。