seismic shift

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Related to seismic: seismic activity, seismic survey

seismic shift

A major change. (Seismology is the study of earthquakes.) That press conference was such a disaster that I'm worried it will cause a seismic shift in how voters view him as a candidate for president. In just the last century, there has been a seismic shift in the treatment of women in this country.
See also: shift