Water each other's plants

1. To maintain an office-relationship between adjacent plant-owners who water each other's plants in the absence of one or the other.

2. By extension, to keep each other company.

"I think they had a plant-relationship back in meat space."
"What do you mean?"
"They used to water each other's plants back when we were in the office."
"Oh, like kept each other company?"
"Yeah; but they literally watered each other's plants, too."