Sekirov Dictionary

err on the side of caution

verb1

•
To act in the least risky manner in a situation in which one is uncertain about the consequences.
- They are all zealous to the last degree in support of the extreme policy. . . . They certainly will not err on the side of caution. — 1867

forms

erred on the side of caution · erring on the side of caution · errs on the side of caution

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