扎堆

扎堆	zhā duī	(of people) to flock together; to congregate
扎	zhā	to prick / to run or stick (a needle etc) into / mug or jug used for serving beer (loanword from "jar")
扎	zhá	used in 挣扎
扎	zā	variant of 扎
扎	zhā	variant of 扎
扎	zā	to tie / to bind / classifier for flowers, banknotes etc: bundle / Taiwan pr. [zha2]
扎	zhā	(of troops) to be stationed (at) / Taiwan pr. [zha2]
堆	duī	to pile up / to heap up / a mass / pile / heap / stack / large amount