It is a stylistic device defined as a syntactic deviation, and interruption within a sentence from one structure to another. In this interruption, the expected sequence of grammar is absent. The grammatical flow of sentences is interrupted in order to begin more sentences.
It is an unexpected discontinuity in the expression of ideas within a sentence, leading to a form of words in which there is logical incoherence of thought.
It is a simple error, although it is also used for deliberate effect, often causing mild confusion and hence attention. It may also be used in poetry and prose to make readers pause and think about any hidden meaning.
Anacoluthon is derived from the Greek word anakolouthos, which means “lacking sequence.”
Example
“you really ought- well, do it your own way”
I can’t believe Christmas is- I just haven’t finished my shopping yet!