Proverbs 29:15 New English Translation

¹⁵A rod and reproof^[a] impart^[b] wisdom,
but a child who is unrestrained^[c] brings shame to^[d] his mother.^[e]

Proverbs 29:15 tn The word “rod” is a metonymy of cause, in which the instrument being used to discipline is mentioned in place of the process of disciplining someone. So the expression refers to the process of discipline that is designed to correct someone. Some understand the words “rod and reproof” to form a hendiadys, meaning “a correcting [or, reproving] rod” (cf. NAB, NIV “the rod of correction”).
Proverbs 29:15 tn Heb “gives” (so NAB).
Proverbs 29:15 tn The form is a Pual participle; the form means “to let loose” (from the meaning “to send”; cf. KJV, NIV “left to himself”), and so in this context “unrestrained.”
Proverbs 29:15 sn The Hebrew participle translated “brings shame” is a metonymy of effect; the cause is the unruly and foolish things that an unrestrained child will do.
Proverbs 29:15 sn The focus on the mother is probably a rhetorical variation for the “parent” (e.g., 17:21; 23:24-25) and is not meant to assume that only the mother will do the training and endure the shame for a case like this (e.g., 13:24; 23:13).

New English Translation (NET)