There's safety in numbers

There's safety in numbers.

something that you say which means if people do something difficult or unpleasant together, they are less likely to get harmed or blamed Working on the principle that there's safety in numbers, we decided we should all go and complain together.
See also: number, safety
References in classic literature ?
You see, sir, it's early as yet; in a few minutes these here rooms will fill up; and there's safety in numbers, as they say.
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