Idiom Breakdown

seismic shift

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Definition

A fundamental reorientation of a state of affairs.

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An allusion to the drastic change to the landscape caused by a massive earthquake.

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"The seismic shift in Mexico began in 1810 with the movement toward independence from Spain."
"For the republican movement, the acceptance of seats in a "partitionist" Assembly signaled a seismic shift in historical attitudes since the division of Ireland in 1921."
"[T]he U.S. could be on the verge of a seismic shift, where it is possible to envision a time when it will no longer be the dominant economic superpower."
"Baby boomers began turning 65 in January, heralding a seismic shift in demographics worldwide."

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