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1. To physically plunge through something. Please don't stand on that rickety part of the floor—you're apt to fall through it!
2. To not be completed or come to fruition; to fail due to some outside circumstances. Oh, we're not going away next week after all—our vacation plans fell through.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
fall through something
to fall and break through something. One of the skaters fell through the thin ice. A number of hailstones fell through the roof of the greenhouse.
[for something, such as plans] to fail. Our party for next Saturday fell through. I hope our plans don't fall through.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Fail, miscarry, as in The proposed amendment fell through, or I hope our plans won't fall through. [Late 1700s]
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.
1. To drop through some object or surface: The skaters fell through the thin ice.
2. To fail to occur: The trip fell through due to lack of interest.
3. To fail to be carried out: Our plans fell through at the last minute.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.