double date
noun
a date on which two couples go together.
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
By the 1950s, the two men were double-dating with Dick and Pat Nixon, whom Hoover had met while pursuing the case against Alger Hiss.
From Slate ● Nov. 10, 2011