1. to reduce or diminish the intensity, expression, or display of enthusiasm or excitement
The coach told the players to tone down their enthusiasm until they actually won the game.
O técnico disse aos jogadores para moderarem o entusiasmo até que realmente ganhassem o jogo.
2. to make something less intense or passionate in expression
She decided to tone down her enthusiasm about the project during the meeting to seem more professional.
Ela decidiu moderar seu entusiasmo sobre o projeto durante a reunião para parecer mais profissional.