From the television show Survivors (1975): In the first episode one of the characters is asked about her son, who is away at boarding school.<br/><br/>Her answer is as follows: <br/>"Well, Peter says there are a dozen or so boys in the school sam, but matron thinks it's some sort of stomach bug."<br/><br/>From the context the "sam" is probably the school infirmary or hospital but I can't find any reference to any rhyming slang that applies.<br/><br/>Keeping in mind that this TV show is forty years old, does anyone know of the source rhyming slang? Is it some other British slang?