1. stifle
2. suppress, stamp down, inhibit, subdue, conquer, curb, moisten
3. wash, wet, muffle
4. mute, dull, damp, tone down, soften, weaken
5. deaden
6. damp, damp, soften, weaken, break, check
7. retard, delay, damp
7. soften, weaken, break, deaden, blunt