drop a brick

Idioms  

1. Also, drop a clanger. Say something indiscreet, commit a social gaffe. For example, John dropped a brick when he called her by his ex-wife's name. [Slang; 1920s]

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Example Sentences

“Imagine what happens if you drop a brick in a flat pond - ripples spread in all directions,” said Robert Hall, a geologist at Royal Holloway University of London, who has studied the area.

From Washington Times

“Imagine what happens if you drop a brick in a flat pond — ripples spread in all directions,” said Robert Hall, a geologist at Royal Holloway University of London, who has studied the area.

From Seattle Times

It might care enough for Lee to drop a brick now and then.

From Project Gutenberg