through the cracks

*through the cracks

Fig. [moving] past the elements that are intended to catch or detect such things. (*Typically: fall ~; drop ~; go ~; slip ~.) I am afraid that some of these issues will slip through the cracks unless we make a note about each one.
See also: crack
References in classic literature ?
His eye shone like a candle through the cracks of the door.
Cocky, staring at the open door, was in just the stage of determining whether or not he should more closely inspect that crack of exit to the wider world, which inspection, in turn, would determine whether or not he should venture out through the crack, when his eyes beheld the eyes of the second discoverer staring in.
A quarter of an hour later I was rushing up and down the room in frenzied impatience, from minute to minute I went up to the screen and peeped through the crack at Liza.
I did not hate her so much, however, when I was running about the room and peeping through the crack in the screen.
In a little while, the door was opened a tiny crack: the old woman eyed her visitor with evident distrust through the crack, and nothing could be seen but her little eyes, glittering in the darkness.