合わす， 合す， あわす
1. to match (rhythm, speed, etc.)
2. to join together, to unite, to combine, to add up
3. to face, to be opposite (someone)
4. to compare, to check with
5. to cause to meet (e.g. an unpleasant fate)
6. to place together, to connect, to overlap
7. to ...
tbd