straight: [14] Straight began life as the past participle of stretch. Nowadays this verb has a perfectly normal past form (stretched), but in Middle English it was straught (source of distraught [14], an alteration of distract) or straight – whence the adjective straight. The sense ‘not bent or curved’ derives from the notion of stretching something between two points. Straightaway [15] originally meant ‘by a straight path’; the temporal sense ‘immediately’ emerged in the 16th century. => distract, distraught, stretch[straight etymology, straight origin, 英语词源]