An example of anastrophe is:After reading any of Shakespeare's works, have you ever felt like his words are being mixed up? Yes, this is the use of the figure of speech called anastrophe. Derived from the Greek word, anastrophe means 'turning back or about'. It can be defined as the reversal of the normal word order in a sentence, for emphasis.
In your example, even within the verb phrase, the order is reversed; 'sat down' becomes 'down sat'.The verb occurs before the subject-noun. Example: Glistens the dew upon the morning grass. (Or, the dew glistens upon the morning grass).
The anastrophe creates an A-B-B-A pattern in the lines of the poem. It also separates the actions of the spider from what is happening with the weather.The Incy Wincy Spider climbed up the water spout.
Down came the rain, and washed poor incy out.
Out came the sun, and dried up all the rain
And then Incy Wincy Spider climbed up the spout again.