掉换

掉换	diào huàn	to swap / to replace / to exchange / to change
掉	diào	to fall / to drop / to lag behind / to lose / to go missing / to reduce / fall (in prices) / to lose (value, weight etc) / to wag / to swing / to turn / to change / to exchange / to swap / to show off / to shed (hair) / (used after certain verbs to express completion, fulfillment, removal etc)
换	huàn	to exchange / to change (clothes etc) / to substitute / to switch / to convert (currency)