not know what you're missing イディオム
missing link|link|missing
n. 1. Something needed to complete a group; a missing part of a chain of things.
A 1936 penny was the missing link in John's collection of pennies. The detective hunted for the fact that was the missing link in the case. 2. An unknown extinct animal that was supposed to be a connection between man and lower animals.
The missing link would be half man and half ape.not apperceive what (one is) missing
To abort to apprehend how abundant article is because one refuses to try or participate in it. This cine is absolutely interesting—you kids don't apperceive what you're missing! A: "I've consistently been too afraid to try skydiving." B: "You don't apperceive what you're missing. It's the adventure of a lifetime!"Learn more: know, missing, not, whatnot apperceive what you’re ˈmissing
not apprehend how good, amusing, interesting, etc. article is because you accept never approved it: ‘I’m not absolutely absorbed in snowboarding.’ ‘Oh, you should accord it a try. You don’t apperceive what you’re missing.’Learn more: know, missing, not, what