shift has 32 distinct synonyms spread across 16 of its 23 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
move and exchange for another
“shift the date for our class reunion”
use a shift key on a keyboard
“She could not shift so all her letters are written in lower case”
change phonetically as part of a systematic historical change
“Grimm showed how the consonants shifted”
change gears
“you have to shift when you go down a steep hill”
lay aside, abandon, or leave for another
“switch to a different brand of beer”
an event in which something is displaced without rotation
a qualitative change
Synonyms, antonyms and the broader and narrower relations for shift come from Princeton University’s WordNet. Full sources and licences.
the act of changing one thing or position for another
“his switch on abortion cost him the election”
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
“they built it right over a geological fault”
a crew of workers who work for a specific period of time