Midriff refers to the middle part of your body, between your chest and your waist. If you think about where your ribs end and your belly button is, that's your midriff area.

The word can sound old-fashioned because people today more commonly say “stomach” or “belly” when talking about this body part. But you'll still see midriff used in fashion articles, clothing catalogs, or when someone wants to be more specific about which part of the torso they mean.