(as) still as a stock
Completely still; not moving at all. You kids need to stay still as a stock out here until the firemen are done investigating the building, OK? I didn't want my grandmother to catch me rooting through her jewelry box, so when I heard her in the hallway, I hid in the closet and stood as still as a stock until she left. He stood as still as a stock after his name was called, too nervous to move.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.