mountain in Sichuan province
崍 is a specific place name referring to a mountain in Sichuan province. It has no broader conceptual meaning beyond this geographical reference.
崍 is a phono-semantic compound with 山 (mountain) as the semantic component and 來 (ライ) as the phonetic. It was created specifically to name a mountain in Sichuan.
The mountain radical 山 on the left combined with 來 on the right points to a specific mountain. Picture a sign on a mountain path in Sichuan with 崍 carved into it.
For ライ, imagine a line of hikers climbing the mountain: line -> ライ, and the mountain is named 崍.
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