not for anything

not for anything (in the world)

Under no conditions or circumstances (will something happen or be the case). If there are bugs in your basement, then I'm not going down there—not for anything! This is a treasured heirloom from my grandmother, so I would never sell it, not for anything in the world.
See also: anything, not

not for ˈanything

(informal) definitely not: I wouldn’t give it up for anything.
See also: anything, not