许你携手到掉牙许你携手到白发
[xŭ nĭ xié shŏu dào diào yá xŭ nĭ xié shŏu dào bái fā]
It expresses the promise of lifelong companionship and devotion to someone, wishing to hold hands through life until old age—both toothless and gray-haired together, symbolizing an eternal bond.