From an unused root (meaning to shout); acclamation -- shout(-ing).
H1959. hedad
הֵידָד noun masculineIsaiah 16:9 shout, shouting, cheer (of a multitude; on formation compare Ol§181 a Sta§ 218 b); — ׳ה only absolute, 16:9 6t. Isaiah & Jeremiah; —
1 shouting in harvest Isaiah 16:10; Jeremiah 48:33 (3 t. in verse) where הֵידָד לֹא הֵידָד חֵידָד יִדְרֹךְ לֹא, i.e. the shouting is no vineyard-shouting, but that of foe, compare below; compare 25:30 ׳י shall utter (עָנָה) a shout like the (grape-) treaders (followed by הָאָרֶץ כָּליֿשְׁבֵי אֶל). Hence also
2 shout of the foe Isaiah 16:9 (עַל נָפַל), Jeremiah 51:14 (הֵידָד עָלַיִךְ וְעָנוּ); compare 25:30; 48:33 above