|Easton's Bible Dictionary|
Dart, the name of the threshing-floor at which the death of Uzzah took place (1 Chronicles 13:9). In the parallel passage in Samuel (2 Samuel 6:6) it is called "Nachon's threshing-floor." It was a place not far north-west from Jerusalem.
Int. Standard Bible Encyclopedia
CHIDON, THE THRESHING-FLOOR OF
ki'-don, (goren kidhon; Septuagint B, omits; A has Cheilo): The place where Uzza perished because he touched the ark (1 Chronicles 13:9). In 2 Samuel 6:6 it is called the threshing-floor of Nachon. No name resembling either of these has been discovered.
Chidon (1 Occurrence)
1 Chronicles 13:9 When they came to the threshing floor of Chidon, Uzza put forth his hand to hold the ark; for the oxen stumbled. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV)