v. To coddle like a pet; to overly indulge; pamper
The things we call aristocracies and reigning houses are the last places to look for masterful men. They began strongly, but they have been too long in possession. They have been cosseted and comforted and the devil has gone out of their blood.
— John Buchan, The Path of the King (1921)
From the same root as “kiss”, in Old English “Cossetung” meant “kissing”.