[單字] moneybags 用he is，是不是不合文法了？

[leefengyuh (野生神龍)]

http://dictionary.cambridge.org/dictionary/british/moneybags?q=moneybags

moneybags = a rich person




所以
he is a rich person = he is a moneybags？


複數，用is，是不是不合文法了？



請教，謝謝

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