The character 叕 is the old core of 缀, meaning to join things together.
Tips
history
叕 is not used independently in modern Chinese. It pictured many hooks joined into a net and is the phonetic core of 缀 (to stitch together), 辍 (to stop), and 啜 (to sip).
register
Archaic; seen only in etymology notes and classical texts, never written on its own today.