New words and phrases appear, while others fall into disuse.
Languages change continually and in wide variety of ways. New words and phrases appear, while others fall into disuse. Words subtly, or less subtly, shift their meanings or develop new meanings, while speech sounds and intonation change continually. Yet perhaps the most fundamental shift in language change is gradual conventionalization: patterns of communication are initially flexible, but over time they slowly become increasingly stable, conventionalized, and, in many cases, obligatory. This is spontaneous order in action: from an initial jumble increasingly specific patterns emerge over time.