Looking on the internet deeply has found these results:

if not is the most popular phrase on the web.

If you aren't 13,310,000 results on the web	if not 1336,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
If you aren't in the moment, you are either looking forward to uncertainty, or back to pain and regret. Jim Carrey. Biography. Author Profession: Comedian. wentz. Read more�... �If you aren't just a little depressed, then you aren't paying very much attention to what's going on in the world.� ? Pete Wentz. tags: pete Oct 29, 2015 ... If you aren't cringing, you aren't improving. Creating is something you can never do as well as it can be done. Make things anyway. *. Gregory�... If you aren't** growing and evolving, you're standing still, and the rest of the world is surging ahead.� ? Louise Penny, Still Life. tags: life, responsibility.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

If you aren't

13,310,000 results on the web

if not

1336,000,000 results on the web

More popular!

If you aren't in the moment, you are either looking forward to uncertainty, or back to pain and regret. Jim Carrey. Biography. Author Profession: Comedian.
wentz. Read more�...
�If you aren't just a little depressed, then you aren't paying very much attention to what's going on in the world.� ? Pete Wentz. tags: pete
Oct 29, 2015 ... If you aren't cringing, you aren't improving. Creating is something you can never do as well as it can be done. Make things anyway. ***. Gregory�...
If you aren't growing and evolving, you're standing still, and the rest of the world is surging ahead.� ? Louise Penny, Still Life. tags: life, responsibility.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.