兴师动众

興師動眾
xīngshīdòngzhòng
  1. to muster large forces
  2. to get a great number of people involved (in carrying out some task)

CEDICT

to mobilize a large number of people

Wiktionary

动员众多人力。《吴子．励士》：「夫发号布令，而人乐闻；兴师动众，而人乐战。」《红楼梦．第四七回》：「今儿偶然吃了一次亏，妈就这样兴师动众，倚着亲戚之势，欺压常人。」也作「劳师动众」、「起兵动众」、「起师动众」、「兴兵动众」、「行军动众」、「行师动众」。

重編國語辭典

Entry Composition

1 兴师 xīngshī
  1. to dispatch troops
  2. to send an army
  3. to mobilize forces
2 动 dòng
  1. (of sth) to move
  2. to set in movement
  3. to displace
  4. to touch
  5. to make use of
  6. to stir (emotions)
  7. to alter
  8. abbr. for 动词 dòngcí, verb
=3 众 zhòng
  1. (bound form) crowd; multitude
  2. (bound form) many; numerous
=3 众 zhòng variant of 众 zhòng