Rashi on Exodus 35:12/רש"י על שמות ל״ה:י״ב

1ואת פרכת המסך means THE CURTAIN OF (that serves for) PARTITIONING — Everything that screens an object, whether it hangs above or in front of it is called מָסָךְ or סְכַךְ. Of similar meaning are: (Job 1:10) “[Hast Thou not] put a partition in front of him?” (שכת = סכת); (Hosea 2:8) “Behold I will partition off (סך = שך) thy way [with thorns]”.