follow
狥 centers on the idea of following or going along with something, like a dog following a command or a person following a path.
狥 combines the animal radical 犭 with 旬, which likely provides the sound. The exact historical development is uncertain, but it may relate to a dog following or a cyclical following action.
A dog (犭) following a ten-day cycle (旬) faithfully: 狥 means to follow.
For シュン, imagine a dog following a shun (しゅん) sound command: shun -> シュン, and the dog follows immediately.