(duì) surname Dui
(duì) to cash; to exchange; to add (liquid); to blend; one of the Eight Trigrams 八卦[ba1 gua4], symbolizing swamp; ☱
(duìfù) to cash (a check)
(duìhuàn) to convert; to exchange
(duìhuànlǜ) currency exchange rate
(duìxiàn) (of a cheque etc) to cash; to honor a commitment