1. to reduce the gap or disparity between two things; to make something less different
These new policies aim to lessen the difference between rich and poor communities.
Essas novas políticas visam diminuir a diferença entre comunidades ricas e pobres.
2. to make two things more similar or closer in value, quality, or degree
The compromise helped lessen the difference between the two opposing parties.
O compromisso ajudou a diminuir a diferença entre os dois lados opostos.