1. something that serves to refresh one’s memory or knowledge of a subject
2. a drink or snack that refreshes
3. additional training or instruction to update skills or knowledge

Examples

• I need a refresher on basic algebra before taking calculus.
• The company provided a refresher course on safety procedures.
• She took a quick refresher in Spanish before her trip to Mexico.
• The meeting included a refresher on the new policies.
• After the long hike, we stopped for refreshers at the café.
• The training manual serves as a good refresher for new employees.
• He attended a refresher seminar to maintain his certification.