How is the prohibition of greater harm to parents inferred from the prohibition of “uff”?

Comprehensive Review and Applied Reasoning in Usul al-Fiqh

• Isharat al-nass, because it is an unintended implication
• Through dalalat al-nass
• Iqtida’ al-nass, because omitted words must be supplied
• Independent analogy, because a new cause must be constructed