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foundation

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shake the foundations of something

to cause a person or organization to question the truth of something it strongly believed For a time his grief over his son's death shook the foundations of his religious faith.

See also: foundation, of, shake

rock/shake something to its foundations

  also rock/shake the foundations of something

to damage or change an organization or a person's beliefs very much Allegations of scandal and abuse have rocked the party to its foundations. The ideas seemed to make sense, but shook the foundations of her own Christian beliefs.

See also: foundation, rock