Yes but you always choose very simple statements like this, and then believe it can be extrapolated to all propositions. There are philosophical ideas which might be put into very few words that have many shades of meaning. You are always trying to fix meaning in such a way that you always know what you mean, and everyone that talks to you does likewise. But the nature of philosophical discourse is such that we will often be considering ideas, the meaning of which is not simple, fixed and clear-cut.
Now I am quite sympathetic to what I think is behind your question. I do agree that people use the tactic of re-definition to evade many difficulties and play all kinds of word games. But nevertheless it is one of those kinds of tendencies which I don't think it will be possible to really get rid of. It is an unavoidable difficulty that a range of meanings will pertain to particular terms, especially in areas like philosophy, so perhaps the best approach is to regard it as an opportunity to argue for particular usages and lead by example.
Well, all that is true, but it is the case that some writers have been sufficiently perspicacious to elicit new meanings from words, or even devising words which were required to capture some meaning that had hitherto not been articulated. Eckhardt and Nietzsche were both credited with doing this for the German language (although I will have to take someone's word for that, as I don't read German.)
But of course this must happen. Language constantly evolves and meanings constantly change. The word 'nice' used to mean 'silly' and 'terrific' used to mean 'dreadful'. Other examples abound. Besides as our view of the world changes - and heaven knows it has never changed so much or so quickly as it has in the last generation - then we have to constantly re-define words and invent new ones to deal with new inventions and new concepts.
It is also the surely the case that philosophers, in particular, have considerably influenced the meaning of words, by discovering nuances or applications of the word that had not been noticed before. I am sure I can find some examples somewhere.....
I didn't use the term 'occult'. I was simply saying that philosophers will bring out meanings in words that have often never been noticed or downplayed. I will try and think of some examples.
'Water' has always meant H2O, but that meaning was only revealed when the chemical composition of water was discovered. Until then, it was hidden.
Or, to take an example from philosophy:
"If I am unmarried man, I am necessarily a bachelor" does not mean what most people think it does. It takes a philosopher to point out the modal fallacy and explain the true meaning of the word "necessarily" and the correct way to use it.