Main Entry: ²cluster

Function: verb

Inflected Form(s): clus·tered; clus·ter·ing \-t(ə-)riŋ\

Date: 14th century

transitive verb 1 : to collect into a cluster <cluster the tents together>
2 : to furnish with clustersintransitive verb : to grow, assemble, or occur in a cluster <they clustered around the fire>