stiff as a board

Another stands stiff as a board on the bottom step of a cabin.

Unmoving and stiff as a board, she appeared to be deceased.

At first, Berry couldn’t run: He lay on the floor, rigid, face not moving, “as stiff as a board,” his tour manager recalled.

“Now you’ll want to hold it out in front of you and press—” I press the button and Magnus goes stiff as a board, his thick arms clapping against his sides.

When the Meyers first brought her home, that little girl refused to make eye contact with Mavis and became stiff as a board while she was held.