"erring" in the verb sense
1. err, mistake, slip
to make a mistake or be incorrect
2. stray, err, drift
wander from a direct course or at random
"The child strayed from the path and her parents lost sight of her"
"don't drift from the set course"
"erring" in the adjective sense
1. erring, error-prone
capable of making an error
"all men are error-prone"
Source: WordNet® (An amazing lexical database of English)
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