Return to a simmer and stir in the spinach or arugula in batches, stirring until they wilt down. (vegkitchen.com)
Stir the spinach gently until it wilts, then add the rest and keep on stirring until wilted. (greenkitchenstories.com)
Add kale and collard greens a handful at a time, seasoning with pinches of salt as you go and stirring until wilted before adding more. (bonappetit.com)