noun
a liquid preparation that is applied to a surface in a thin, transparent layer to form a hard, glossy, or protective coating
verb
to apply varnish to (a surface)
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The furniture maker applied a coat of varnish to protect the wood.
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I'm going to varnish the old table to make it look new again.
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Let's varnish this project before the deadline hits.
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She tried to varnish the truth, but everyone could see through her lies.