Definition of fall down in US English:

fall down

phrasal verb

  • Be shown to be inadequate or false; fail.

    ‘the deal fell down partly because there were a lot of unanswered questions’
    • ‘Where the Times fell down was in the awkward split between its two sections.’
    • ‘It fell down on information governance, MRSA rates and its stroke unit facilities.’
    • ‘Tuck and everyone at the SQA were confident that would be the case but then fell down on the task.’
    • ‘Of course, this falls down if surfers fail to double-check the authenticity of a site.’
    • ‘Dunblane was where the handgun licensing system fell down catastrophically.’
    fail, be unsuccessful, not succeed, lack success, not make the grade, not come up to expectations, fall short, fall flat, disappoint
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