godan verb (-su), transitive verb
tie together; link; connect; correlate
Used for physically tying things together or for linking abstract concepts. Often interchangeable with 結び合わせる, but 結び合わす can sound slightly more colloquial or direct.
See also: 結び合わせる
ロープを結び合わして長くする。
Tie the ropes together to make them longer.
二つの事件を結び合わす証拠が見つかった。
Evidence linking the two incidents was found.