touch and go

touch and go idiom
Extremely uncertain or risky, as in It was touch and go after the surgery; we were not sure he'd survive it, or It was touch and go but they finally gave me a seat on the plane. This idiom implies that a mere touch may cause a calamity. [Early 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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