in the unlikely event of

in the unlikely event of (something)

If a very improbable outcome turns out to be the case. I wouldn't worry too much, but in the unlikely event of unemployment, you can always come live with us for a while. In the unlikely event of me winning the lottery, the first thing I would do is travel to Jamaica.
See also: event, of, unlikely
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

in the unlikely event of something

 and in the unlikely event that something happens
if something—which probably will not happen—actually happens. In the unlikely event of my getting the job, I'll have to buy a car to get there every day. In the unlikely event of a fire, please walk quickly to an exit.
See also: event, of, unlikely
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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