[countable] a period of time worked by a group of workers who start work as another group finishes. to work a shift; I've just finished an eight-hour shift.

[intransitive, transitive] to move, or move something, from one position or place to another. Lydia shifted uncomfortably in her chair.

period of work; 2[countable] a period of time worked by a group of workers who start work as another group finishes to be on the day/night shift at the ...

move; 1[intransitive, transitive] to move, or move something, from one position or place to another Lydia shifted uncomfortably in her chair.

There are 44 meanings listed in OED's entry for the noun shift, ten of which are labelled obsolete. See 'Meaning & use' for definitions, usage, and quotation ...

to do things without help from other people You're going to have to shift for yourself from now on.

There are 61 meanings listed in OED's entry for the verb shift, 22 of which are labelled obsolete. See 'Meaning & use' for definitions, usage, and quotation ...

a great and important change in the way something is done or thought about. Wegener's theory led to a paradigm shift in the earth sciences.

​a great and important change in the way something is done or thought about. Wegener's theory led to a paradigm shift in the earth sciences.

shift noun [C] (MOVE OR CHANGE). a change in position or direction: There's been a substantial shift in doctors' methods.