toron-to
Heavy-lidded eyes or something melting into a soft, smooth state. Describes sleepy eyes or melted cheese.
💡A child getting sleepy — 'Her eyes went toron-to as she fought sleep.'
眠くてとろんとした目をしている。
She has toron-to droopy eyes from sleepiness.
His eyes went ___ heavy after the big lunch.
大きな昼食の後、目が○○となった。