The phrase "to bottle up" means to keep something inside, often emotions or feelings that are difficult to express. It can also mean to suppress or hold in one's thoughts and feelings instead of sharing them with others.
Sentences with «to bottle up»
Once it's cool, bottle it up in a spray bottle and leave it in your refrigerator. (mindbodygreen.com)
If you weigh 140 pounds, you should be filling that 20 - ounce bottle up with water at least three and a half times a day, every single day. (elizabeth-finch.com)