1. To lose strength, vigor, or effectiveness toward the conclusion of something
The team's performance began to weaken at the end of the season.
O desempenho do time começou a enfraquecer no final da temporada.
2. To become less intense or convincing as something concludes
His argument started strong but weakened at the end.
Seu argumento começou forte, mas enfraqueceu no final.
3. To diminish in physical or mental capacity near the end of an activity
The runner's pace weakened at the end of the marathon.
O ritmo do corredor enfraqueceu no final da maratona.