兑
兌duì
#2,419 most
frequent character
to cash, to exchange, to add (liquid)
Character breakdown
Source: Make Me a Hanzi.
兑 shows 丷, air from the mouth, and 兄, a person with an open mouth, together suggesting happiness. That gives the first meaning, to be happy. The later meaning 'to exchange' was borrowed for the sound, not from the picture; from it came 'to cash'.
Drawn as: air from mouth; person with open mouth
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