en_tn/pro/22/15.md

Foolishness is bound up in the heart of a child

"The heart of a child is full of foolish things"

the rod of discipline

The writer speaks of a parent using any form of discipline as if that parent were hitting the child with a wooden rod. (See: rc://en/ta/man/jit/figs-metonymy)

drives it far away

The writer speaks as if foolishness were a person that another person could use a physical rod to drive away. Alternate translation: "will make a child wise" (See: rc://en/ta/man/jit/figs-metaphor)