/ ˈdæmpən; NAmE / verb [ vn ]
1.
(also less frequent damp ) to make sth slightly wet :
Perspiration dampened her face and neck.
He dampened his hair to make it lie flat.
2.
to make sth such as a feeling or a reaction less strong :
None of the setbacks could dampen his enthusiasm for the project.
She wasn't going to let anything dampen her spirits today.