A "double date" refers to a social outing where two couples go on a date together. It means that two pairs of people, usually romantic partners, spend time together as a group. Full definition
For instance, you could set up a fun double date with friends. (creditdonkey.com)
Try to plan interesting dates, make special meals, go on double dates and go on activities that will spark conversation and interaction such as going for a hike or taking classes together. (datingsites50.com)
Escape rooms are a good idea for double dates and group dates too. (dating.lovetoknow.com)