To make a mistake.
He erred in his calculations, and made many mistakes.
To sin.
To err is human, to forgive, divine.
to stray.
Elongated form of er (“sound of hesitation”).
Err... what did you just say?
From Middle English erren, from Old French errer (“to wander, err, mistake”), from Latin errō (“wander, stray, err, mistake”, verb), from Proto-Indo-European *h₁ers- (“to be angry, lose one's temper”)...
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