to exchange; to convert; to cash in a check or voucher; to claim a prize

to add a liquid to another; to blend or mix liquids together, such as adding cold water to hot water

to trade pieces of equal value in a board game like chess

(bound form) the Dui Trigram (☱) in the 八卦 bā​guà, symbolizing a swamp or lake; also one of the Sixty-four Hexagrams (䷹)

the Chinese surname Dui

(archaic) to please or be pleased