A device that moistens or dampens something.(noun)
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Use "dampener" in a sentence
""The Axon move has come as a short-term dampener for Infosys to some extent," said Harit Shah, a sector analyst with Angel Broking in Mumbai."
"What's been a dampener is the slump in satellite, music and home video rights."
"What could be a dampener is the possible impact of the drought in many parts of the country, which could impact the figures for the March 15 advance tax collection."