1. substances that cause fermentation, such as yeast or bacteria

1. undergoes or causes fermentation, a chemical process in which bacteria or yeast breaks down sugars
2. causes or experiences agitation, unrest, or excitement

Examples

• The grape juice ferments into wine over several weeks.
• She ferments her own kombucha at home using a special culture.
• Political unrest ferments in the capital city.
• The baker uses natural ferments to make sourdough bread.
• Heat ferments the mixture more quickly than cold temperatures.
• Social media often ferments anger and division among users.
• Traditional ferments like yogurt cultures have been used for centuries.