Leaven
nounIdea
processes of transformation. it refers to ideas or forces that change systems gradually.
Comparison
A substance (like yeast or baking powder) that causes dough to rise and become light. Metaphorically, it is an influence that changes a whole situation.
Examples in use
The dissident's ideas acted as a leaven throughout the oppressed society.
A small leaven of hope can transform an entire community's outlook.
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