out of an abundance of caution

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err on the side of caution

To avoid risky or irresponsible behavior; to be very cautious. I like to err on the side of caution and always keep some money in my savings account. Since we don't know where we're going, let's err on the side of caution and leave an hour early.
See also: caution, err, of, on, side

out of an abundance of caution

In an earnest attempt to ensure that any potential danger, risks, or problems are avoided. Out of an abundance of caution, I always make sure I have enough money to cover six months' worth of expenses in my savings account, in case anything ever happened to my job. We believe that the allergic reaction was specific to that patient's genetic makeup, but we've also temporarily stopped administering the drug at that dose out of an abundance of caution.
See also: caution, of, out
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

err on the side of caution

COMMON If you err on the side of caution, you decide to act in a careful way, rather than take risks. It is better on your first few weights sessions to err on the side of caution, and start with a weight which is lighter than you think you can handle. Note: People use other words instead of caution, according to the subject they are discussing. When I discussed the matter with ministers in July I said that we should err on the side of generosity.
See also: caution, err, of, on, side
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
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