To lessen; to dull; to make less intense (said of emotions and non-physical things).
To become damped or deadened.
To become damp or moist.
To make damp or moist; to make moderately wet.
To extinguish the courage of; to dishearten; to depress the spirits of; to deprive of confidence; to deject.
To persuade somebody not to do (something).
Lack of courage