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shit a brick
rude slang To be very scared or nervous. The plural ("shit bricks") is also commonly used. Of course I shit a brick when I woke up to the sounds of an intruder in my house! My brother is so strong and scary-looking that people shit bricks when he threatens them.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
shit bricks/a brick
To become extremely worried or frightened.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.