rounder-upper
nounUK /ˌraʊndərˈʌpə/
US /ˌraʊndərˈʌpər/
A person who brings people or things together in one place.
The rounder-upper gathered all the kids for the game.
OTHER MEANINGS
2. A person whose job is to find and bring in animals that have strayed.
The ranch hired a rounder-upper to bring back the lost cattle.
3. A device or tool used to gather scattered items into a pile.
He used a rounder-upper to sweep the leaves into one big heap.
4. A person who rounds numbers to simpler values.
As a careful rounder-upper, she turned 4.87 into 5 before adding.