1. to create, perform, or make something without preparation or planning
2. to make or create something using available materials when proper equipment is not available

Examples

• The jazz musician improvises a solo during the performance.
• When the teleprompter broke, the news anchor improvises her closing remarks.
• The chef improvises a new dish using leftover ingredients.
• He improvises a shelter using branches and leaves.
• The comedian improvises jokes based on audience suggestions.
• She improvises a speech when asked to speak unexpectedly.
• The mechanic improvises a temporary fix with wire and tape.