a date on which two couples go together.
Pronunciation: (dub'ul dāt'), [key]
—v., -dat•ed, -dat•ing. Informal.
to take part in a double date.
to accompany (someone) on a double date: They double-dated the two sisters.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.