1. maintenance procedures performed on a vehicle or machine to improve its performance
Usage: plural of tuneup
2. practice sessions or preparatory activities to improve performance
Usage: informal; plural of tuneup

Examples

• The mechanic recommended regular tuneups for the old car.
• Both vehicles needed major tuneups before the road trip.
• The team scheduled several tuneups before the championship game.
• Annual tuneups help prevent costly engine problems.
• The band held tuneups before their concert tour.
• These practice tuneups improved the orchestra’s timing.