Is it to err on the side of caution or to air on the side of caution?

Answer:
The expression is "to err on the side caution". It means if you must make an error, make it in a safe direction not the risky direction.
First answer by Notyouraveragedummy. Last edit by Notyouraveragedummy. Contributor trust: 391 [recommend contributor recommended]. Question popularity: 0 [recommend question].