peril
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at (one's) own peril
Done with the foreknowledge or forewarning that there is implied danger, especially of loss of life, which one must accept as one's own responsibility. Those who skydive do so at their own peril.
fraught with danger
Very unsafe or risky. A trip to that part of town at night would be fraught with danger—why risk it?
fraught with peril
Very unsafe or risky. A trip to that part of town at night would be fraught with peril—why risk it? The villagers warned that our journey through the Carpathian Mountains would be fraught with peril.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
fraught with danger
Cliché [of something] full of something dangerous or unpleasant. The spy's trip to Russia was fraught with danger. My escape from the kidnapper was fraught with danger.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
(do something) at your (own) ˈperil
(often used as a warning) at the risk of serious danger: People who go climbing in winter do so at their own peril. ♢ You go in Mike’s car at your peril. He’s a terrible driver.See also: peril
Farlex Partner Idioms Dictionary © Farlex 2017
fraught with danger/peril
Very risky indeed. Fraught with means “full of ” and is rarely used today except in the sense of something undesirable. The expression, a cliché since the nineteenth century, first appeared in print in 1576 as “fraught with difficulties”; the precise cliché was first cited by the OED as appearing in 1864 in H. Ainsworth’s Tower of London: “This measure . . . is fraught with danger.”
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer