1. to reduce speed or pace progressively as one approaches the conclusion or completion of something
The runner began to decelerate towards the end of the marathon.
O corredor começou a desacelerar no final da maratona.
2. to slow down momentum, progress, or intensity in the latter stages of an activity or process
The economic growth started to decelerate towards the end of the fiscal year.
O crescimento econômico começou a desacelerar no final do ano fiscal.