earwax

2. A natural substance produced by glands in the ear canal to protect against dust and germs.

Earwax traps tiny bits of dust before they can reach the eardrum.

3. A buildup that can sometimes block hearing if it becomes too hard or packed.

Too much earwax can make your ears feel plugged.

4. Informal term for someone who is overly eager to please or flatter.

He acted like an earwax, always agreeing with the boss.