A dipody is a metrical unit made up of two feet, especially in classical Greek and Latin verse, where poets and critics often count rhythm in paired feet rather than one foot at a time. The two feet function together as a single rhythmic beat or measure.
The term is most often used when discussing patterns such as iambic or trochaic verse in older metrical systems.
Example
The wind | against the wall | the window | the door
Each pair | of feet | moves as | one measure