1) Bedew 2) Check 3) Conquer 4) Curb 5) Depress 6) Diminish as enthusiasm 7) Dull 8) Exclusively Anglo word 9) Exclusively Saxon word 10) Get a bit wet 11) Humidify 12) Inhibit 13) Keep in check 14) Lessen in effect 15) Lessen in force or effect 16) Make moist 17) Make soundproof 18) Moisten 19) Moisturize 1) Bedew 2) Deaden 3) Dishearten 4) Humidify 5) Irrigate 6) Moisten 7) Moisturise 8) Moisturize 9) Reduce 10) Water 11) Wet 
• (v. t.) To make damp or moist; to make slightly wet. • (v. t.) To depress; to check; to make dull; to lessen. • (v. i.) To become damp; to deaden.
Damp'en intransitive verb To become damp; to deaden. Byron. Damp'en transitive verb [ imperfect & past participle Dampened ; present participle & verbal noun Dampening .] 1. To make damp or moist; to make slightly wet. 2. To depress; to check; to make dull; to lessen. « In ...
[v] - reduce the amplitude (of oscillations or waves) 2. [v] - make vague or obscure or make (an image) less visible 3. [v] - check 4. [v] - lessen in force or effect
damp verb lessen in force or effect; `soften a shock`; `break a fall`