earplug
nounUK /ˈɪəplʌɡ/
US /ˈɪrplʌɡ/
A small soft thing you put in your ear to block loud sounds.
She wore earplugs to sleep through the noisy traffic outside.
OTHER MEANINGS
2. A plug of wax or cotton used to keep water out of the ear.
Swimmers often use earplugs to keep water out of their ears.
3. A small device inserted into the ear to reduce loud noise at work.
Factory workers must wear earplugs near the loud machines.
4. A piece of material used to protect the ear from cold or injury.
He stuffed earplugs of wool under his hat on the freezing day.