bubble under

Meaning

1. to be likely to be very successful or popular soon

   Here are two records that are bubbling under.

In the movies · 2

• "Once upon a time, there was a magical princess "who lived in a magical bubble under the sea.Precious: Based on the Novel 'Push' by Sapphire2009
• - I love Ron and Hermione's romance and the way that sort of just bubbles away under the story constantly.Harry Potter 20th Anniversary: Return to Hogwarts2022

From the same entry

• the bubble bursts
• burst bubble