groupthink
noun[U]
MEETINGS,MANAGEMENTuk/ˈɡruːpθɪŋk/us(alsogroup think)theprocessin whichbaddecisionsare made by agroupbecauseitsmembersdo notwanttoexpressopinions,suggestnewideas, etc. thatothersmaydisagreewith:
Most of usthoughttheproductwouldn'tsell, but nobody told theboss– that's thedangerofgroupthink.