1. to lose momentum, confidence, or effectiveness toward the end of a competition, performance, or process
The runner faltered in closing stages of the marathon, losing her lead in the final kilometers.
A corredora vacilou nos estágios finais da maratona, perdendo sua liderança nos últimos quilômetros.
2. to weaken or show signs of failure as something approaches its conclusion
The team's performance faltered in closing stages of the season.
O desempenho do time vacilou nos estágios finais da temporada.