Functional shift
Encyclopedia
In linguistics
Linguistics
Linguistics is the scientific study of human language. Linguistics can be broadly broken into three categories or subfields of study: language form, language meaning, and language in context....

, functional shift occurs when an existing word takes on a new syntactic function
Syntax
In linguistics, syntax is the study of the principles and rules for constructing phrases and sentences in natural languages....

. For example, the word like, formerly only used as a preposition in comparisons (as in "eats like a pig"), is now also used in the same way as the subordinating conjunction as in many dialect
Dialect
The term dialect is used in two distinct ways, even by linguists. One usage refers to a variety of a language that is a characteristic of a particular group of the language's speakers. The term is applied most often to regional speech patterns, but a dialect may also be defined by other factors,...

s of English (as in "sounds like he means it"). The boundary between functional shift and conversion
Conversion (linguistics)
In linguistics, conversion, also called zero derivation, is a kind of word formation; specifically, it is the creation of a word from an existing word without any change in form...

 (the derivation of a new word from an existing word of identical form) is not well-defined, but it could be construed that conversion changes the lexical meaning and functional shift changes the syntactic meaning.

Shakespeare uses functional shift, for example using a noun to serve as a verb. Researchers found that this technique allows the brain to understand what a word means before it understands the function of the word within a sentence.
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