not bat an eye
US /nɑt bæt ən aɪ/
UK /nɑt bæt ən aɪ/

1.
tidak berkelip mata, tidak menunjukkan reaksi
to show no surprise or concern when something unusual or shocking happens
:
•
When she heard the bad news, she didn't bat an eye.
Apabila dia mendengar berita buruk itu, dia tidak berkelip mata.
•
He told them he was quitting, and they didn't bat an eye.
Dia memberitahu mereka bahawa dia akan berhenti, dan mereka tidak berkelip mata.