The word 'straightening' is built upon the core concept of 'straight', which originates from the Old English streht, the past participle of streccan meaning 'to stretch'. This etymological link reveals the original logic: something made straight is something that has been fully stretched out, with no bends or slack. The Germanic suffix '-en' was attached to the adjective to create the verb 'straighten', meaning 'to make straight'. The addition of the present participle suffix '-ing' then transforms the action into an ongoing process or its resulting state. Thus, the modern abstract meaning of correcting posture, aligning objects, or tidying one's affairs logically extends from this ancient idea of removing physical curvature through stretching.

Structure: straight (direct, not bent) + en (verb suffix) + ing (present participle suffix) - straight: From Middle English streght, streyt, from Old English streht (past participle of streccan 'to stretch'), of Proto-Germanic origin. In this word, it functions as the core adjective/root meaning 'direct, not curved'. - en: A verb-forming suffix of Germanic origin, used to form verbs from adjectives or nouns (e.g., widen, strengthen). Its role is to convert the adjective 'straight' into the verb 'straighten'. - ing: A suffix of Old English origin, forming the present participle and verbal noun. Its role is to indicate the ongoing action or state resulting from the verb.