erring

动词 err:

1. to make a mistake or be incorrect
   同义词：err, mistake, slip
2. wander from a direct course or at random
   同义词：stray, err, drift

形容词 erring:

1. capable of making an error
   同义词：error-prone

1. Good students as they were (=Though they were good students), they sometimes erred.
   虽然他们是好学生，偶而也会犯错。
2. She erred in failing to meet him in person.
   她错在没有亲自与他见面。