full flush; one-suit hand
Mahjong term: a winning hand composed entirely of tiles from a single suit. Also used figuratively for something uniform or homogeneous.
from Chinese qīng yī sè
He won with a full flush.
The members of this project are all engineers, a homogeneous group.
Extended use from mahjong: describes a situation where everything is of the same kind or from the same source, often in manufacturing or team composition.
This product is made entirely from domestically sourced parts.