One of them started down after us, but after a nearly fatal slip he scrambled back up.

At any moment you may make some fatal slip.

He was concentrating so on his determination to prove that he could think properly for himself that he made a fatal slip, inexcusable in any Trade explorer.

That was the slip that Crinston made, and the fatal slip; that, and failing to report that telephone conversation in his testimony to the jury.

And a man off his guard, as you said, may make a fatal slip.

Officials expressed concern that mounting fatigue and stress from investigating Ebola and recent outbreaks of other deadly viruses could lead a scientist to make a fatal slip.

Obviously that wily man had made some fatal slip in his planning.

She also made a fatal slip by revealing that Lucy was bought off the black market by Billy.

Ah, fatal slip!

In any single moment of the years since then the fatal slip might have been made.