beard
頾 centers on facial hair, specifically a beard. It is a rare kanji for beard, with the given meanings focused on that single concept.
頾 combines 須 (beard, chin hair) with 此, which likely contributes a phonetic element. The exact historical development is uncertain, but the character is a rare variant for beard.
The top part 須 already means beard, and the bottom 此 looks like a person sitting with a prominent chin. Picture a beard growing from the chin area of 此, reinforcing the beard meaning.
For シ, imagine a single long beard hair that looks like the letter 'C' (シー): 'C' -> シ, and that curved hair is the beard.