When they came to Nachon's threshing-floor— The word נכון Nachon is used by way of anticipation, in allusion to the fate of Uzzah; for נחה nakah, signifies to smite, and נכון nachon, the act of smiting. In 1 Chronicles 13:9 it is called the threshing-floor of Chidon, which conveys the same idea; for כיד kid, signifies destruction. See Houbigant's note on the verse.
The oxen shook it— The oxen stuck in the mire. Bochart. tom. 1. 13.