dampen
damp.en \'dam-p*n, 'damp-*m\ \'damp-(*-)nin\ \'damp-(*-)n*r\ vb or damp.en.ing 1: to check or diminish the activity or vigor of : DEADEN 2: to make damp 3: DAMP 1: to become damp 2: to become deadened or depressed - damp.en.er n
Webster's English Dictionarydamp.en \'dam-p*n, 'damp-*m\ \'damp-(*-)nin\ \'damp-(*-)n*r\ vb or damp.en.ing 1: to check or diminish the activity or vigor of : DEADEN 2: to make damp 3: DAMP 1: to become damp 2: to become deadened or depressed - damp.en.er n