From cakak; a portico (as covered) -- covert.
see HEBREW cakak
H4329. mesak
[מוּסָךְ] noun masculine architectural term (si vera lectio) of some covered structure, otherwise unknown; — only construct מוּסַחהַֿשַּׁכָּת 2 Kings 16:18 Qr (Kt מיסך i.e. מֵיסַךְ); — ᵐ5 τὸν θεμέλιον τῆς καθέδρας, i.e. הַשֶּׁבֶת מוּסַד ?