This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
酙 combines 酉 (wine vessel) with 斗 (measuring ladle), suggesting a connection to measuring or pouring wine, but the exact historical development is uncertain.
A wine vessel 酉 beside a measuring ladle 斗: imagine carefully measuring wine, but the kanji's meaning is unclear.
For シン, picture a thin stream of wine being poured from the ladle into the vessel: thin -> シン, and the wine is measured precisely.