wine pot
卣 refers to a specific type of ancient Chinese ritual vessel used for holding wine. Its meaning is narrowly focused on this wine pot.
卣 is a pictograph of a lidded wine vessel, with the top ⺊ representing the lid and the bottom 囙 the body of the pot. The exact historical development is uncertain, but the vessel shape is well established.
The top ⺊ looks like a lid, and the bottom 囙 is a container with a base. Picture an ancient lidded pot used for storing wine.
For ユウ, imagine you and a friend sharing wine from this pot: you -> ユウ, and the wine pot brings you together.