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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.
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.
Fail, miscarry, as in The proposed amendment fell through, or I hope our plans won't fall through. [Late 1700s]
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.