1
general::
Phrase(s): let something slip (out)
Fig. to reveal a secret carelessly or by accident. • I didn’t let it slip out on purpose. It was an accident. • John let the plans slip when he was talking to Bill.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. 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 mid1500s, the variant from the late 1500s. 2. 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] 3. let slip through one's fingers. Fail to seize an oppor tunity, as in We could have won the trophy but we let it slip through our fingers. [First half of 1600s]
American Heritage Idioms