1. fastener, retainer, toggle, catch

2. bondsman, surety, guarantor, bailor, backer

3. safety strap (for securing a sword)

4. neck collar (on a horse)

5. fastening cord (of a cape or cloak), chinstrap

6. catch, latch

7. lock tumbler

8. safety catch, rifle sear

9. gutter hook (for fastening a gutter to a building)

10. boy’s buttock (colloquial)