When in doubt, it's always best to err on the side of caution.
erratic behavior
Frequency:
70
%
Her erratic behavior worried her friends.
err in judgment
Frequency:
65
%
He erred in judgment by trusting the wrong person.
err on the side of generosity
Frequency:
45
%
It's better to err on the side of generosity when dealing with others.
Idiomatic Expressions for err
Phrase: to err is human
Meaning: it is natural for people to make mistakes
Usage: Don't be too hard on yourself for making a mistake, remember that to err is human.