1. noun. General. Work period, usually a scheduled duration of eight hours.
2. noun or verb. Scenic. A scene change or, to make a scene change, "scene shift."
3. noun or verb. General. A change or deviation
, "to shift gears," "musical pitch
4. noun. Costumes. A garment, historically an under-garment worn by both women and men. From http://www.weartheshift.com/faq.php
A shift is a simple, easy-fitting
dress designed to fit close and comfy around the shoulders and bust, then glide down in an A-line
shape over your waist and hips. It is not fitted at the waist, but people belt them all the time.