(intransitive, formal) To make a mistake. / (intransitive) To sin. / (archaic) to stray.

Alternative form of er (“sound of hesitation”)

(law) Abbreviation of errors.

Third-person singular simple present indicative form of err

Everyone makes mistakes.

(transitive, idiomatic) To behave in a manner which favours or which is biased toward. / To choose which mistake (err) will be perpetuated when all available options would result in different mistakes.

Third-person singular simple present indicative form of err on the side of

(idiomatic) To act in the least risky manner in a situation in which one is uncertain about the consequences.

Extended form of to err is human

Third-person singular simple present indicative form of err on the side of caution