IPA: /ˈslɪpkeɪs/
KK: /ˈslɪpˌkeɪs/
A type of box that is open at one end, designed to hold and protect books or magazines.
She carefully placed the rare book into its slipcase to keep it safe.
Slipcase → It is formed from "slip" (from Old English "slipan", meaning to slide or glide) and "case" (from Latin "capsa", meaning a box or container). A slipcase is a container designed to allow something to slide in and out easily.
Think of something that 'slides' ('slip') into a 'box' ('case') — that's how a slipcase works.