Silver lining (idiom)
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A silver lining is a metaphor for optimism in vernacular English, which means a negative occurrence may have a positive aspect to it.
A cloud with a silver lining
Optimism
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Optimism is the attitude or mindset of expecting events to lead to particularly positive, favorable, desirable, and hopeful outcomes. A common idiom used to illustrate optimism versus pessimism is a g
Half a glass of water, illustration of two different mental attitudes, optimism (half full) and pessimism (half empty)
An optimist and a pessimist, Vladimir Makovsky, 1893