verb. form an arch over.
verb. be central or dominant.
1. Verb, base form If they're tight, you won't be able to lower your leg all the way or your lower back will overarch to compensate. 2. Noun, singular or mass Keeping your back flat (do not round the upper back or overarch the lower back), imagine spreading the floor and pushing the floor away as you drive up to a standing position. 3. Verb, non-3rd person singular present Since the goal is to press the weight directly overhead, many people overarch their lower back, which can lead to pain and may strain your muscles, especially if they're lifting heavy.