D. Binominal: word combined
D1. There are cafes here and there. (scattered round)
D2. We’ve had meetings on and off. (occasionally)
D3. I’ve been running back and forth all day. (to and from somewhere)
D4. To and fro can be used just like back and forth.
D5. He is unemployed and down and out. (without a home or money)
D6. She’s better now, and out and about again. (going out)
D7. She ran up and down the street. (in both directions)
(Source: English Vocabulary in Use, Cambridge University Press)