1. to fall behind in progress, development, or performance; to move or progress more slowly than others
The student is lagging behind in math compared to his classmates.
O aluno está ficando para trás em matemática comparado com seus colegas.
2. to fail to keep pace with developments or trends
The company is lagging behind its competitors in technology adoption.
A empresa está ficando para trás de seus concorrentes na adoção de tecnologia.