play it cool字面意思酷酷的玩，实际意思：假装冷静，故作镇定

【例句】
It's ridiculous to play it cool if someone you're mad about is mad about you too.
如果让你生气的人也在生你的气，而你还要假装冷静，那就太可笑了。

They agreed that they would play it cool if they saw the girls again.
他们一致同意，如果再见到那些女孩他们将泰然处之。