1. fall between the cracks - Verb
2. fall between the cracks - Phrase
fall between the cracks (third-person singular simple present falls between the cracks, present participle falling between the cracks, simple past fell between the cracks, past participle fallen between the cracks)
(idiomatic) To wind up in an unexpected situation which is, inadvertently, invisible to or not handled by whatever process one had hoped to be subject to; to be overlooked.
I submitted my application for student finance months ago, but haven't heard back. I think I've fallen between the cracks.
I have a great sensitivity to kids. I have a great sensitivity to the people that fall between the cracks. Carl Paladino
If the goal of the No Child Left Behind Act is to ensure that all children meet state standards, then allowing large numbers of the most disadvantaged children to fall between the cracks is unacceptable. Roy Barnes