Qal Imperfect3masculine singularוַּיִּקֹּד Genesis 24:26 +, etc.; — usually + וַיִּשְׁתַּחוּ etc.; in worship of ׳י Genesis 24:26,48; Exodus 4:31; Exodus 12:27; Exodus 34:8; Numbers 22:31; 2Chronicles 20:18; 29:30; Nehemiah 8:6; homage to man of rank Genesis 43:28, king 1 Samuel 24:9 (Gi v.1 Samuel 24:8), 1 Samuel 28:15; 1 Kings 1:16,31; to ׳י + king I Chron 1Ki 29:20.
II. קדד (√ of following; meaning dubious.; Late Hebrew קָדְקד = Biblical Hebrew; Assyrian ‡a‡‡adu = קָדְקֹד; compare Jewish-Aramaic).
A primitive root; to shrivel up, i.e. Contract or bend the body (or neck) in deference -- bow (down) (the) head, stoop.