“below” and “beneath” can refer to people or things that are unworthy in some way or of a lower social ranking.
Some people think she married below her family.
This meaning is negative, however. So exercise care when using it.
Does "exercise care" means here "be careful"? Is it an idiom? I looked it up in some dictionaries but didn't find an item/entry for it.
Should I go with these meanings in the Cambridge Dictionary and put them together?
exercise: to do physical activities to make your body strong and healthy
care: the process of protecting someone or something and providing what that person or thing needs