shade: [OE] Shade and shadow [12] are ultimately the same word. Both originated in Old English sceadu. Shade is the direct descendant of this, whereas shadow comes from its inflected form sceaduwe. Sceadu itself went back via prehistoric Germanic *skathwō (source also of German schatten and Dutch schaduw) to Indo- European *skotwá (whence also Greek skótos ‘darkness’ and Welsh cysgod ‘shade’). Shed ‘hut’ probably originated as a variant of shade. => shadow, shed[shade etymology, shade origin, 英语词源]