leg tilt
https://www.wikihow.com/Do-a-Tilt-in-Dance
refers to the pelvic tilt which occurs when maintaining a standing position on one leg and doing a leg lift with the other, the leg lift is not caused purely by movement in the hip joint of the lifted leg, but also of the movement of the base hip joint which changes the pelvic angle and lifts the free leg's hip joint higher
the resulting pelvic tilt moves the entire torso and head with it, unless the spine bends to maintain an upright angle of the head
general usage refers to a 180-degree split which usually requires movement in both hip joints like this
usually a side split or mixed split which causes lateral pelvic tilt and requires side-bending of the spine to compensate for
can also refer to a front split bending torso forward into a prone angle (anterior pelvic tilt) which requires spinal extension to compensate for and remain head-vertical, or backward into a supine angle (posterior pelvic tilt) which requires spinal flexion to compensate and remain head-vertical