out of an abundance of caution

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Related to erred on the side of caution: give rise to, pick up the slack, within means

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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References in periodicals archive ?
Luckily, Gary erred on the side of caution, deciding on a one-all draw and came closest in guessing the first goal scored time.
With no change in income tax or National Insurance and petrol price rises being put off until September, Ms Davies said Gordon Brown had erred on the side of caution.
'We take security very seriously so when we received this information we erred on the side of caution and we withdrew the system.'
"We would always people erred on the side of caution. We can only help if we're notified of incidents."
Daughter Carol, 54, said: "You can see St Thomas's from where they were dining and given her history of little strokes, they erred on the side of caution. But it's good news today."
D3/4r Cymru/Welsh Water bosses last night said they previously erred on the side of caution and told some unaffected communities to boil their water.