He said he broke up with his last girlfriend because she was beginning to 'crowd' him. [=she was not allowing him enough privacy and independence]
Her parents are concerned that she's been hanging out with 'a bad crowd'. [=with people who do illegal or immoral things]
He was never one to 'follow the crowd', so we weren't surprised when he dropped out of college to start his own business.
(..) There's probably , people in there. - You're kidding. - Is that all? All? In particle physics, is Woodstock. Oh. Well, then, good. I wasn't expecting such a crowd. I'm nervous. - It's okay. Open with a joke, you'll be fine. - Okay, joke. Okay. How about this? Um, okay. There's this farmer, (..)2008 TvShow: The Big Bang Theory Title: The Cooper-Hofstadter Polarization Season: 1 Episode 9