外貨
がいか · gaika · JLPT N1 · noun
money
💵 外 (outside) + 貨 (money) = gaika: money from outside your own country
外 means outside or foreign, and 貨 means goods or currency. Joined together they name foreign currency, the money of another country. Read it as gai + ka, with the first part sounding like the word guy.
外 — evening 夕 + divination 卜
Originally a compound of 夕 (evening) and 卜 (divination). Ancient Chinese divinations were performed in the morning; doing them at evening (夕) was considered irregular or 'outside' the norm. From this sense of deviation, 外 came to mean 'outside' or 'external'.