Well, at least you have the right character here Phil, because that was not the character used by others here
As for the 'hidden' reference, I know that many various dictionaries have a massive array of variations, and in fact whack that character into Google translate and you will get 'conceal'
http://translate.google.co.uk/?hl=en...E4%BC%8F%0D%0A
Always being open to learning should be mandatory for all Wing Chun teachers imho as I learn new things about myself and my style every single day! One of the many reasons I still love Wing Chun