Deafen/ˈdefn/ Definition 1 of 2Pro Tip 1/3Literal Meaning Used to describe actual hearing loss, often due to extreme noise exposure. Firefighters' sirens can deafen you without proper ear protection. Pro Tip 2/3Permanent Effect Implies that the hearing loss might be irreversible. Regularly using power tools without earmuffs can deafen over time. Pro Tip 3/3Serious Tone Often used in solemn or serious contexts due to its association with disability. The veterans were deafened in the line of duty.