Hi If you google "Say cheese", you can find it translated into various languages with the same meaning - to make the subjects of a photograph smile. From language to language, it seems to change depending on two things: the subjects must find it funny or absurd; and, in saying it, it should cause them to move their mouths as if smiling I think you may find that modern photographers will use any word so long as it does these two things In a slightly different way, there is the phrase "Watch the birdie". This seems to refer to the taking of children's portraits.
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