"Everyday words are inherently imprecise. They work well enough in everyday life that you don't notice. Words seem to work, just as Newtonian physics seems to. But you can always make them break if you push them far enough.
I would say that this has been, unfortunately for philosophy, the central fact of philosophy. Most philosophical debates are not merely afflicted by but driven by confusions over words. Do we have free will? Depends what you mean by "free." Do abstract ideas exist? Depends what you mean by "exist."
I think Wittgenstein deserves to be famous not for the discovery that most previous philosophy was a waste of time, which judging from the circumstantial evidence must have been made by every smart person who studied a little philosophy and declined to pursue it further, but for how he acted in response. Instead of quietly switching to another field, he made a fuss, from inside. He was Gorbachev.
The field of philosophy is still shaken from the fright Wittgenstein gave it. Later in life he spent a lot of time talking about how words worked. Since that seems to be allowed, that's what a lot of philosophers do now."
--- How to do philosophy (via Leuschke)