1. To deliberately show less excitement, interest, or eagerness about something than one actually feels; to downplay one's enthusiasm
He played down his enthusiasm about the promotion to avoid seeming overconfident.
Ele minimizou seu entusiasmo sobre a promoção para não parecer excessivamente confiante.
2. To intentionally reduce the apparent level of excitement or energy in a situation
She played down her enthusiasm when discussing the surprise party so as not to spoil it.
Ela minimizou seu entusiasmo ao discutir a festa surpresa para não estragar tudo.