The phrase "to slip by" means to pass or go by without being noticed, often unintentionally. It can also refer to an opportunity that is missed or avoided due to inaction or neglect.
Sentences with «to slip by»
This was just too big a week to let slip by without talking about the most important gaming event of the year. (bytesizeimpressions.com)
Keep your eyes peeled in blog sales, though; this isn't one you want to let slip by again. (wacie.com)
New mechanics allow you to expand on your strategy to slip by unnoticed and take guards out with pure efficiency. (videochums.com)