The phrase "main lifts" refers to the most important exercises in a workout routine or a sport. These are the foundational movements that target multiple muscle groups and have a significant impact on overall strength and fitness. Full definition
Once all three main lifts go stagnant, it's time to eliminate everything but the basics. (anymanfitness.com)
This approach is obviously for individuals training mostly for strength or doing a strength phase in which you focus on one main lift per workout. (t-nation.com)
Please note: Between 17th April and 12th June 2017, work will be taking place on the two main lifts in resort. (loveholidays.com)