1. To gradually slow down, weaken, or fall behind as one approaches the conclusion or final stages of something
The runner began to lag toward the end of the marathon.
O corredor começou a perder o ritmo no final da maratona.
2. To show declining performance, enthusiasm, or progress in the final phase
The team's energy seemed to lag toward the end of the season.
A energia do time parecia diminuir no final da temporada.