1.<正式>(make mistakes)犯错误；弄错；搞错
The judge erred in giving his directions to the jury.法官给予陪审团引导这件事是错误的。
2.<正式>(do wrong)作恶；犯罪；走歪路
He was a miserable offender who had erred and strayed.他曾是个可悲的罪犯, 一个犯了错误误入歧途的浪子。
3.to err on the side of sth
(act with more of quality)(行为上)更趋向于…, 宁愿过于…
We want to err on the side of safety.我们在安全防护方面宁可过之。
4.<正式>(be unfaithful)husband, lover +出轨；不忠
If you make a threat, be sure to carry it out if he errs again.如果你采用威胁的手段, 那么如果他再次出轨, 你就得说到做到。