intransitive. To form compact groups; to mass or cluster together. Also: to come out in a mass.

To congregate in a cluster or group; to assemble, collect closely.

To run together or collect in knots or heaps; to crowd together. (Quot. 1598 connects with 3.)

intransitive. = constellate, v. 4.

intransitive. To cluster or congregate together, as stars do in a constellation.

intransitive. To crowd together in a body. Also with up.