play it cool

US /pleɪ ɪt kuːl/
UK /pleɪ ɪt kuːl/
"play it cool" picture
1.

kalm blijven, cool doen

to act in a calm, unemotional way so that people think you are not anxious or excited

:
When she saw her ex-boyfriend, she tried to play it cool.
Toen ze haar ex-vriend zag, probeerde ze kalm te blijven.
Just play it cool and don't show them you're nervous.
Blijf gewoon kalm en laat ze niet zien dat je nerveus bent.