Double over

Near-synonyms: double up, buckle over

doubled over in pain

A padded knee shattered my balls. I doubled over in the hallway, coughing up blood and yellow stuff I thought might be bile.

“Do you have documents on you?” asked one of the guards. “Good, then we’ll know how to mark your grave if you fall behind the convoy.” The joke made his comrades double over with laughter.

He doubled over the sheet of paper and wrote something on the back.