bubble-up

Short definition from Wiktionary

Noun

1. 1
   A culvert that is open to the air on top.
2. 2
   A commotion or controversy.
3. 3
   Something that causes effervescence.
4. 4
   An act or process of bubbling up.
5. 5
   Alternative form of bubble-up.

Verb

1. 1
   To move upward in bubbles or in a way suggesting bubbles.
2. 2
   To reach the surface; to emerge.