The word 'stitch' originates from the Old English stice, meaning a puncture or a sharp pain, which is related to the Proto-Germanic stikiz, a stab or a prick. This root is derived from the Proto-Indo-European base steig-, meaning to prick or to stick, connecting the physical action of piercing with a needle to the concept of sewing. The addition of the '-ed' suffix, a common Germanic grammatical marker for completed action, transforms the base verb into its past tense and participial form. Thus, 'stitched' literally means "having undergone the action of pricking/piercing with thread," which evolved into the modern sense of something being sewn or joined together.

Structure: stitch + ed - stitch: From Old English stice (a puncture, stab, pricking). In this word, it functions as the root verb meaning to sew or join with thread. - ed: A suffix of Germanic origin, used to form the past tense and past participle of regular verbs, indicating a completed action or state.