play it cool
US /pleɪ ɪt kuːl/
UK /pleɪ ɪt kuːl/

1.
berlagak tenang, bersikap acuh tak acuh
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.
Apabila dia melihat bekas teman lelakinya, dia cuba untuk berlagak tenang.
•
Just play it cool and don't show them you're nervous.
Hanya berlagak tenang dan jangan tunjukkan kepada mereka bahawa anda gementar.