Not bat an eye/eyelash

Not bat an eye/eyelash ENG: to show no sign of surprise or worry when something unexpected happens RUS: и бровью не повести I remember getting on a bus once, and a minute later, bracing for impact – the bus careened out of control and collided with a roadside barrier. Luckily, no one was injured apart from mild bumps and bruises. What I found amazing, and even a little bit funny, was that no one kicked up a fuss; everybody just took it in stride. The passengers dusted themselves off and trudged to the next stop to catch another bus. Just like that. As if this were something that happened on a regular basis. They didn’t even bat an eyelash – resilience in action. -Pacey, did it ever occur to you that maybe I don’t want to live my life this way? That maybe I have grown up? -Have you? -What’s that supposed to mean? -It means, simply put that you don’t care who I sleep with. I could’ve had sex with that woman on the table right next to you and you wouldn’t have batted an eyelash. -Pacey, you slept with my roommate for an entire year. I think it’s a little late for me to start to get skittish on the topic of you and other women.