1. to match (rhythm, speed, etc.)
それに合わせるように、俺も笑う。As if to match that, I smile too.
2. to join together; to unite; to combine; to add up
二人のお金を合わせても足りない。Even with both our money put together, it isn't enough.
3. to face; to be opposite (someone)
それどころか、眼すら合わせようともしません。On the contrary, they won't even try to make eye contact.
4. to compare; to check with
5. to cause to meet (e.g. an unpleasant fate)
6. to place together; to connect; to overlap
私は体の前で手を組んで、人差し指を合わせる。I clasp my hands in front of me and press my index fingers together.
7. to mix; to combine
8. to put blade to blade; to fight
正面から剣を合わせる。Clash swords head-on.