وَعِنْدَ الزَّجَّاجِ: هُوَ مَصْدَرٌ، تَقْدِيرُهُ: أَدَّبْتُهُ تَأْدِيبًا، وَجَبُنْتُ جُبْنًا.
Translation: Al-Zajjāj treats it as a verbal noun and gives this reconstruction: “I disciplined him—disciplining,” and “I acted cowardly—cowardice.”
The author records an alternative grammatical analysis attributed to al-Zajjāj. Keep it distinct from the initial cause-complement analysis.