E.g.,here Wittgenstein is demanding that one's assumptions about language match up with how language is really used, for instance where he goes

Consider for example the proceedings we call "games." I mean board-games, card-games, ball-games, Olympic games, and so on. What is common to them all? - Don't say: "There must be something common, or they would not be called 'games'" - but look and see whether there is anything common to all. - For if you look at them you will not see something that is common to all, but similarities, relationships, and a whole series of them at that. To repeat: don't think, but look!