Right component supplies the sound:
若 ruò → nuò with onset shift. Adds a faint flavour —
若 originally depicted a person combing hair while answering 'yes,' so the 'consent' sense of
诺 is faintly visible in the phonetic itself. Same phonetic in
喏 nuò (here you are),
匿 nì (hide).
唯唯诺诺 ('yes-yes' submissive) preserves
诺's original 'yes' meaning.
