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The metaphor I suggested above is missing a word "like", i.e. You are like a pig (in one way).
If everyone uses a metaphor, it becomes a cliche, as is "You are a pig".
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We used to subsume
similes under metaphors as that subgroup that made their comparisons with the use of «like» or «as». I sincerely hope, in any event, that metaphors of the type «you are a pig» have
not become cliches ! Forty years on, I remember a young lady who worked as a secretary in a school in which I taught in Japan, who, while accompanying me to the train station, giggled and said «
Day-san wa, kao ga pigu no iro desu, ne !» (You know, your facial colour is that of a pig !) An example of Asia's revenge on the «White» - or more accurately, Pinko-grey - man ! Alas, I was ungallant enough to reply that she, eight months pregnant as she was, «
pigu no katachi desu, ne !» (And you its shape !) But despite this mishap,we became good friends....
Henri