Leaven

Definition

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.

What it describes

processes of transformation. it refers to ideas or forces that change systems gradually.

Examples in context

• The dissident's ideas acted as a leaven throughout the oppressed society.
• A small leaven of hope can transform an entire community's outlook.