A primitive root meaning to wag; used only as a denominative from zanab; to curtail, i.e. Cut off the rear -- smite the hindmost.
see HEBREW zanab
H2179. zinneb
[זִנֵּב] verbdenominative Pi`el cut off, or smite, the tail, only figurative, of hostile attack in war; Perfect consecutive 2 masculine plural וְזִנַּבְתֶּם Joshua 10:19 (followed by אֹתָם); Imperfect3masculine singular כָּלהַֿנֶּחֱשָׁלִים בְּךָ וַיְזַנֵּב Deuteronomy 25:18; in both = attack or smite in the rear.