n.
Function: verb
Inflected Form: clus · tered ; clus · ter · ing \ -t( ə -)ri ŋ \
Date: 14th century
transitive verb
1 : to collect into a cluster < cluster the tents together>
2 : to furnish with clusters
intransitive verb : to grow, assemble, or occur in a cluster <they cluster ed around the fire>