The onomatopoeic sound of bells, coins, or metal objects jingling or clashing together.

他的口袋里装满了硬币，走起路来叮当响。

Extremely poor; used figuratively to describe a state of poverty where one has nothing left but the sound of empty pockets, usually in the phrase '穷 qióng得 de叮当 dīng​dāng响 xiǎng'.

他家以前穷得叮当响，现在日子好过多了。