Meaning: If a plan or a deal falls through, it doesn't work out and it's dropped or scrapped.
- fall through Our plans for a holiday in Greece fell through when Bob lost his job. We couldn't afford to go after that.
- has fallen through The deal has fallen through because they couldn't agree on the payment terms.
fall through: plan, deal, arrangement, sale, purchase
Their plan to start a restaurant fell through, so they'll be