The phrase "muscle attachment" refers to the point where a muscle connects to a bone or another structure in the body. It's like the meeting point between the muscle and the bone where they join together. Full definition
Adding load in the lifting phase of a barbell complex also requires dealing with slowing down movements in the eccentric phase to avoid putting undue strain on muscle attachments. (resistancebandtraining.com)
An extra (fourth) muscle attachment site, called a trochanter, at the point on the femur that meets the hip is also found in dinosauromorph Marasuchus lilloensis. (sciencenews.org)
Since the pelvis has muscle attachments from the trunk (abdominals and lumbar erector spinae) and from the hip (gluteus maximus, hamstrings, iliopsoas, and rectus femoris), it can be moved by contractions from various muscles. (strengthandconditioningresearch.com)