1. past tense of gnash; ground or struck the teeth together, especially in anger or pain

Examples

• He gnashed his teeth in frustration when he missed the winning shot.
• The angry dog gnashed its teeth at the intruder.
• She gnashed her teeth as she watched her rival accept the award.
• The patient gnashed his teeth during the painful procedure.
• The villain gnashed his teeth and vowed revenge.
• He gnashed his teeth so hard that his jaw ached.