The term 'Narrow Winning Margin' refers to a situation in which the difference between the winning and losing sides is very small. This can be expressed by the crossword solutions EDGE (4 letters) and INCH (4 letters). An EDGE is a thin, sharp line, while an INCH is a unit of length equal to 1/12 of a foot. Together, these two words suggest that the difference between the winning and losing sides was very small, likely measured in fractions of an INCH.