1. To gather closely around someone or something. In this usage, "crowd in" can be followed by "on" and then a particular person or thing. When the teacher announced story time, the kids all crowded in. I hate when people crowd in on a buffet as soon as it's served.
2. To fill a space with more than it can reasonably hold or accommodate. In this usage, a noun or pronoun can be used between "crowd" and "in," and "into" can be used instead of "in." We can't crowd anyone else in, unless we move the lecture to the auditorium.
3. To push one's way into a certain place or area. In this usage, "into" can be used instead of "in." We tried to crowd into the lecture hall, but the professor told us it was filled to capacity.
crowd someone or something in(to) somethingand crowd someone or something in
to push or squeeze someone or something into a place or a container. They tried to crowd a dozen people into that tiny room. Then they crowded in one more. They all tried to crowd themselves into the same room.
crowd in (on someone or something)
to press or crush around someone or something. Please don't crowd in on the guest of honor. Can you keep them back from me? I don't like it when they crowd in. The people crowded in on us and frightened us a little bit. Don't crowd in on the display case. It is an antique.