fall through the cracks

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fall through the cracks (third-person singular simple present falls through the cracks, present participle falling through the cracks, simple past fell through the cracks, past participle fallen through the cracks)

1. (idiomatic) To be missed; to escape the necessary notice or attention.
   • 2008, Kari Dunn Buron, Pamela J. Wolfberg, Learners on the Autism Spectrum: Preparing Highly Qualified Educators:

     Although more than two decades have passed, not a day goes by that I don't wonder how things could and should be different for the many children like Lydia who fall through the cracks because they are misdiagnosed, mistreated, or simply misunderstood.