One way to hold scratchy is to picture a dragged lightly across something. Nothing is cut and nothing breaks — but a thin rough line is left, and the place it touched keeps complaining afterwards. Every use of the word is that same small rough drag, landing somewhere different: on your skin, inside your throat, in your ear, on the paper, or on your patience.
From the word’s history
Wiktionary gives the word straight: scratch + -y. The -y ending turns a thing you do into what something is like, so scratchy is literally what tends to scratch, or what feels as if it has been scratched.
Wiktionary 直接記下這個組合：scratch（抓、刮）加上形容詞字尾 -y。-y 把一個動作變成一種性質，所以 scratchy 字面上就是「會刮人的」「像被刮過的」。
Wiktionary entry for scratchy, etymology_text: From scratch + -y (kaikki:3f6f69a190036ae4:662668555)
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