let slip

Also, let slip or slide by ; let slide . Miss an opportunity; waste time. For example, We forgot to buy a ticket and let our big chance slip by , or He let the whole day slide by . The first term dates from the mid-1500s, the variant from the late 1500s.

Also, let slip out . Reveal something, usually inadvertently, as in He let it slip out that he had applied for the vacant position . [Mid-1800s]

let slip through one's fingers . Fail to seize an opportunity, as in We could have won the trophy but we let it slip through our fingers . [First half of 1600s]