HSK C7-9
Correct

簇

/ cù / 
Strokes

Definition

crowded/framework for silkworms/gather foliage/bunch/classifier for bunched objects

Example

As a Verb

crowd/cluster together; form a cluster; pile up

As a Noun

cluster; pile; bouquet

As a Measure word

cluster; bunch; clump; crowd

As an Adverb

very; completely