This verse repeats the last part of 4.3. See there for comments.

Notice that 4.3 includes at the beginning a phrase not repeated here. Many scholars assume that this was omitted because of a copyist’s error, and some go so far as to insert the “missing” phrase here. But there is no textual evidence to support this, so in such cases we simply follow the text as it is.

Quoted with permission from Ogden, Graham S. and Zogbo, Lynell. A Handbook on the Book of Song of Songs. (UBS Helps for Translators). New York: UBS, 1998. For this and other handbooks for translators see here .