What is CBL? CBL stands for Collar Bone Length. This abbreviation makes reference to hair that extends down to the level of the collar bone. POSTS RELATED TO THIS TERM You Thought You Left These Behind When You Went Natural… Why Couldn’t God Give Me Straight Or Wavy Long Hair? Shrinkage Never Ceases To Amaze Us- 11 Pictures Of Natural Hair … TweetPinShare0 Shares Home » Glossary » C » What is CBL?