1. A modifier key whose main function is shifting between two or more functions of any of certain other keys (usually by pressing Shift and the other button simultaneously).
noun
2. A type of women's undergarment, a slip.
“Just last week she bought a new shift at the market.”
verb
3. (sometimes figurative) To move from one place to another; to redistribute.
“We'll have to shift these boxes to the downtown office.”