1. To become lifeless, less lively, intense, or active; lose life, force, or vigor.
2. To convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil.
3. To lessen the momentum or velocity of.
4. To make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation; SYN. blunt.
5. To make vapid or deprive of spirit.