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.

• someone's answer something
• someone's ass is on the line
• someone's bag of tricks
• someone's bark is worse than bite
• someone's bark is worse than their bite
• someone's beauty sleep
• someone's best bet
• someone's better half
• someone's blood boils
• someone's blood is up
• someone's blood runs cold
• someone's bottom drawer
• someone's bottom line
• someone's bread and butter
• someone's butt is on the line
• someone's claim to fame
• someone's days are numbered
• someone's ears are flapping
• someone's eyes are bigger than belly
• someone's eyes are bigger than stomach
• someone's eyes are bigger than their belly
• someone's eyes are bigger than their stomach
• someone's eyes are out on stalks
• someone's face doesn't fit
• someone's face is a picture