1. if something you hope to achieve slips through your fingers, you do not manage to achieve it
- He has seen the world championship slip through his fingers twice.
- This is my big chance to make a career in journalism. I can't let it slip through my fingers.
- The dream is slipping through our fingers.
2. if someone slips through your fingers they manage to escape from you
- We've got men guarding all the exits and more men on the roof. He won't slip through our fingers this time.