eyelashes
睫 centers on the fine hairs that fringe the eye: eyelashes. It is a specific body-part kanji with no major abstract extensions.
睫 combines 目 (eye) with 疌, which likely contributes the sound and may relate to fine or quick movement, fitting the idea of eyelashes.
The left side is an eye 目, and the right side 疌 looks like a row of fine hairs. Picture the eye framed by delicate eyelashes.
For ショウ, imagine a show of long eyelashes batting dramatically: show -> ショウ, and the eye 目 is the star of the show.
turned-in eyelashes; ingrown eyelashes; trichiasis