Back-to-back has been used to describe houses that are literally back-to-back with no separation. These days, back-to-back events happen consecutively. A baseball player with back-to-back home runs hit two in a row. A President with back-to-back victories won two elections in a row. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.