Thou hast indeed smitten — i.e., thou hast thoroughly worsted; gained a brilliant victory over Edom. (The “indeed” qualifies “smitten.”)
Hath lifted. — Rather, lifteth.
Glory of this, and tarry at home. — Literally, be honoured, and abide in thine own house, i.e., be content with the glory thou hast achieved. Rest on thy laurels, and do not risk them by further enterprises which may not turn out so favourably. So the Vulg. Thenius explains: “Show thy might at home,” referring to the LXX. (Comp. 2 Samuel 6:20).
For why shouldest thou meddle to thine hurt? — Rather, and why shouldst thou challenge or provoke (literally, attack, Deuteronomy 2:5) disaster?