Do a double-take

To “do a double-take” is to look at someone or something and then look again because you have a delayed reaction to something unexpected. I was walking down the street with a friend and he pointed out another person sitting at a table at an outdoor café. And my friend said, “That’s a really popular influencer.” And I “did a double-take:” “influencer” was not a popular word before social media. I looked at the influencer twice because I had a delayed reaction to seeing him in person. I “did a double-take” when I saw her hair cut short and dyed red.