v.1. To move close together to form a tightly packed group: The football team huddled up to discuss the next play.
2. To cause a group to come together in a tightly packed crowd: I huddled the children up in a group in the museum lobby. The police huddled up the protesters and led them into the van.
3. To assume a position with the limbs drawn up close to the body: The lost hiker huddled up under a shelter made of branches and leaves.