let (something) slide by
to forget or miss an important time or date
I let my girlfriend's birthday slide by without noticing it.
Amazing Nail Art Designs For Beginners With Styling Tips
Digital Nail Art
These nail paint designs look very cool if done properly. To get this look paint your nails white and let them dry completely, now make black lines using black striper pen and fill some spaces with different colors and leave some spaces white. If needed draw black lines again to give neater look. When it dries completely apply fast drying top coat.