Strong's Definition
a primitive root meaning to wag; used only as a denominative from 2180; to curtail, i.e. cut off the rear
KJV Usage: smite the hindmost
STEPBible — Tyndale Abridged Hebrew Lexicon
זָנַב (za.nav) — to cut off the tail. 1) to cut off 1a) (Piel) to attack the rear, smite the tail
UBS Dictionary of Biblical Hebrew
UBS Dictionary of Biblical Hebrew © United Bible Societies, licensed CC BY-SA 4.0.
Brown-Driver-Briggs Hebrew Lexicon
[זִנֵּב] vb. denom. Pi. cut off, or smite, the tail, only fig., of hostile attack in war base