Choker (noun)

1. A necklace worn close to the throat.
2. A person or thing that chokes or suffocates.

Origin:

From choke + -er.

Examples:

1. She wore a choker necklace with her dress.
2. The choker necklace was a popular fashion accessory in the 1990s.
3. The choker was made of pearls.
4. The choker was a tight fit and made it hard for her to breathe.
5. The choker was a choking hazard for young children.