Fretting about the future was futile.
She was through fretting and crying.
This doesn't have anything to do with you fretting about my weight, does it?
Such parts as may be subjected to extreme heat and the fretting action of molten material, as the tuyere and slag breasts of blast furnaces, and the fire bridges and bed plates of reverberatory furnaces, are often made in cast iron with double walls, a current of water or air being kept circulating through the intermediate space.
There was no sense in fretting over it.