Refers to something that reduces or eliminates differences among people or things, often metaphorically. Death is often seen as the great leveller.
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Positive Connotation
In modern contexts, 'leveller' implies fairness and equality, promoting a positive view. Many view the internet as a social leveller, giving voice to those who were voiceless.
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Not Always Literal
Don't confuse this with literal leveling. It usually means bringing parity in power, status, or opportunity. Accessible education is a leveller that can help bridge economic divides.