緩める

ゆるめるyurumeru

ichidan verb · transitive

1. to loosen
2. to slacken
3. to relax (attention, efforts, etc.)
4. to let down (one's guard)
5. to relieve (tension)
6. to relax (a rule)
7. to ease (e.g. restrictions)
8. to loosen (control)

Study it in Yanamino