H2179
זָנַב
to cut off the tail
1) to cut off 1a) (Piel) to attack the rear, smite the tail
Full Brown-Driver-Briggs lexicon entry
[זִנֵּב] verbdenominative Pi`el cut off, or smite, the tail, only figurative, of hostile attack in war; Perfect consecutive 2 masculine plural וְזִנַּבְתֶּם Josh 10:19 (followed by אֹתָם); Imperfect 3 masculine singular וַיְזַנֵּב בְּךָ כָּלהַֿנֶּחֱשָׁלִים Deut 25:18 in both = attack or smite in the rear.
2 occurrences
Deuteronomy (1), Joshua (1)