From Longman Dictionary of Contemporary Englishthe herdthe herdPSpeople generally, especially when thought of as being easily influenced by others You have to be an individual; it’s no use running with the herd. the herd instinct (=the need to behave in the same way as everyone else does) → herd
Examples from the Corpus
herd instinct• But there is a herd instinct.• It seems to me that the Cabinet has an obsessively self-protective herd instinct which could be its undoing.• In my view, it's the herd instinct. 