to collapse; to cave in; to fall down

to sink; to droop; to become concave or flat

to calm down; to settle down; to become composed

to lose spirit or momentum; to be crestfallen

(of plants or animals) to lose freshness, become thin, or sag

(of the bottom of a container) to fall out or come off; (of food) to collapse or stick to a steamer due to overcooking