to strike a shattering blow: to smash or grievously wound with a forceful, targeted stroke
This is a poet's word. It never turns up in ordinary storytelling, only in Israel's oldest hymns and songs, and it always names a violent, crushing blow. Nearly every time, the one who strikes is God pictured as a warrior, or a king fighting on his behalf. The target is usually a specific part of the body, above all the head or skull, so the word carries the vivid image of an enemy's head split open in battle.
The same action is dialed up or down by its setting, which is why one word covers a range English needs several words for. In battle poetry it means to shatter or smash: God crushes the heads of his enemies, breaks the ancient sea-monster, and treads down kings. In two passages where God says he both harms and heals, the same verb softens to "wound": the grievous blow that God alone can also mend. The force is one; only the context tells you whether the blow is meant to kill or is a wound that will be bound up again.
The word also carries a deep pedigree. Long before Israel, the same root named the signature blow of a warrior-god smashing the head of the sea-dragon in the myths of neighboring peoples. Israel's poets took that inherited vocabulary of cosmic combat and handed the crushing victory to the LORD.
Nuances
How to read the verb in Psalm 68:23 (Hebrew 68:24), where the received text says God's foot shatters in blood: keep the standard shatter sense, emend to a look-alike verb meaning wash or bathe, or posit a rare dip sense.
- contestedKeep the received text with the ordinary shatter sense: God's tread pounds enemies into a pool of their own blood.; Marvin E. Tate, Psalms 51-100 (Word Biblical Commentary; Dallas: Word, 1990); Frank-Lothar Hossfeld and Erich Zenger, Psalms 2 (Hermeneia; Minneapolis: Fortress, 2005)
- contestedCorrect the text to a near-identical verb meaning to wash or bathe, matching the parallel image of Psalm 58:10.; BDB, s.v. מחץ; Hans-Joachim Kraus, Psalmen (Biblischer Kommentar Altes Testament XV; Neukirchen-Vluyn: Neukirchener, 1978)
- minorityRead a distinct sense to dip or plunge, appealing to an Arabic cognate and to the ancient Greek and Latin versions that render dipped; comparative evidence for this sense is weak, since the closest relatives never mean dip.; Wilhelm Gesenius, Lexicon Manuale Hebraicum et Chaldaicum, trans. S. P. Tregelles