You can quit breathing if you want to.

The prints on his throat were rapidly growing more red, His heart had stopped, he had quit breathing.

Wren eased her sword clear of its sheath and quit breathing.

She's as dead as if she'd quit breathing.

He was still struggling to look away when the other sagged into a sitting position and quit breathing.

Jair flattened himself against the earth and quit breathing.

Jimmy sucked in one sharp breath, then quit breathing until his chest started hurting and reminded him to start again.

He could no more have denied her this than he could have quit breathing.

Then his eyes fixed and he quit breathing.

"Your eyes were open and you quit breathing."