in fortunate circumstances financially; moderately rich; "they were comfortable or even wealthy by some standards"; "easy living"; "a prosperous family"; "his family is well-situated financially"; "well-to-do members of the community"
Someone who is well-off is rich enough to be able to do and buy most of the things that they want. My grandparents were quite well off. = well-to-do The well-off are people who are well-off. higher tax rates on the well-off