Earplug (noun)

1. A device worn in the ear to block out noise.
2. A small piece of foam, rubber, or other material that is worn in the ear to reduce the amount of sound that enters.

Origin:

Early 20th century: from ear + plug.

Examples:

1. He inserted the earplugs to block out the sound of the noisy construction.
2. The earplugs were effective in reducing the noise of the loud concert.
3. The earplugs were comfortable and didn't cause any discomfort or irritation.
4. The earplugs were reusable and could be washed after use.
5. The earplugs were a crucial part of the swimmer's gear, helping to prevent water from entering the ear.