The term 'slip through the cracks' is a phrase that is used to describe something that has been overlooked or missed. The crossword solutions for this phrase are 'SEEP' and 'OOZE'. SEEP is a verb that means to slowly pass through a porous surface, while OOZE is a verb that means to slowly trickle or flow out. Both words can be used to describe the idea of something slipping through the cracks, as they both imply a slow and gradual movement.