A feared imbalance between the nuclear arsenals of the United States and the Soviet Union (originally and chiefly as an issue in the 1960 American Presidential campaign).
Origin
1950s.
Definition of missile gap in US English:
missile gap
noun
Politics historical
A feared imbalance between the nuclear arsenals of the United States and the Soviet Union (originally and chiefly as an issue in the 1960 American Presidential campaign).