Why Does Erring Mean?

going astray; in error; wrong. sinning.

Can you say erring on the side of caution?

to be especially careful rather than taking a risk or making a mistake: 25 people have replied to the invitation, but I've erred on the side of caution and put out 30 chairs.

What is erring on the side?

Definition of err on the side of

: to use or show more of (something) than may be needed so that one can be sure that he or she is using or showing enough of it It's better to err on the side of generosity than to appear too stingy.