▼tn The two lines are parallel synonymously, so the “severe discipline” of the first colon is parallel to “will die” of the second. The expression מוּסָר רָע (musar raʿ, “severe discipline”) indicates a discipline that is catastrophic or harmful to life.

▼sn If this line and the previous line are synonymous, then the one who abandons the way also refuses any correction, and so there is severe punishment. To abandon the way means to leave the life of righteousness which is the repeated subject of the book of Proverbs.