margin of safety
safety margin
margin of error

The main thing in these jobs was to have enough safety margin.

That left a margin of safety, but a small one.

It was all down to technology, and just how much of a safety margin had been built into his Skin.

Another five minutes and he wouldn't have the safety margin he'd need to return to the ship.

Using margin of safety, one should buy a stock when it is worth more than its price on the market.

In fact, we are talking about a safety margin at least 50 times lower than the levels for which possible health effects have been established.

"We want a big margin of safety, because if something goes wrong, the business will have staying power."

That provides a small safety margin because some of these models can go close to 100 miles an hour.

We'll take ten of those, leave ourselves a safety margin.

But some property owners don't have even his safety margin.