A person or thing that absorbs something, or a device designed to reduce the impact or effect of something.
From absorb + -er (agent suffix indicating one who performs an action or a device that does something). The agent suffix -er is one of the most productive in English.
Shock absorbers in car suspension systems use hydraulic fluid and clever engineering to convert dangerous vibrations into harmless heat—they're literally protecting you from feeling every pothole on the road.
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