From shaqaph in its original sense of overhanging; a lintel -- lintel.
see HEBREW shaqaph
H4947. mashqoph
מַשְׁקוֺף noun [masculine] probably lintel of door; — ׳הַמּ Exodus 12:7(P), 12:22; 12:23(J).
שׁקץ (√ of following; compare Assyrian šikƒu, apparently a (skin-?) disease; Late Hebrew Pi`el שַׁקֵּץ, Aramaic Pa`el שַׁקֵּץ detest are denominative; RSJphil.xiv. 71ff. conjecture original meaning let fall, throw away, compare Arabic fall, drop down, but very dubious).