This improvement upon the original usage was introduced by no less a man than Stubb, in order to afford the imperilled harpooneer the strongest possible guarantee for the faithfulness and vigilance of his monkey-rope holder.
And now it is struck; for, starting from his trance into that unspeakable thing called his "flurry," the monster horribly wallowed in his blood, overwrapped himself in impenetrable, mad, boiling spray, so that the imperilled craft, instantly dropping astern, had much ado blindly to struggle out from that phrensied twilight into the clear air of the day.
There are no more uses of "imperil" in the book.
Show samples from other sources
the terrorist attack imperils peace talks
I told Sana that your brother’s escape depended on it—and that giving any more details could imperil the jailbreak.