Idiom
let something slip through fingerslet (something) slip through (your) fingers
1.
to waste an opportunity to achieve something.
This is my big chance to make a career in journalism and I can't let it slip through my fingers.
Usage notes: sometimes used without let:
He has seen the world championship slip through his fingers twice.
2.
to fail to get or keep something.
The team lost one of their star players to Seattle last year, and didn't want to let another slip through their fingers.