To fill a space almost completely, leaving little or no room for movement. Fans began to crowd the stadium hours before the concert started.
To press closely together; to gather in large numbers. The students crowded around the teacher to see the experiment.
To push or force one's way into a space. He crowded into the elevator just before the doors closed.
To fill one's mind or thoughts persistently. Worries about the future began to crowd his mind.