Look at the ingredient on the next line.  More than likely it is the same ingredient just in a different measurement such as:

1 cup flour PLUS
1 tablespoon flour

This is either for an unusual measurement, or for a divided use of the ingredient (such as 1 cup being used in one part of the recipe and 1 tablespoon being used in another part of the recipe).  You may also see MINUS used, such as:

1 cup flour MINUS
1 tablespoon flour

This is equivalent to the term "scant", or less the ingredient on the second line.