Definition: (of a liquid) produce bubbles of air or gas rising to the surface; sparkling,
The "C" handshape represents a cup or any container (known as "classifier"). You can also adjust the size of the "C" handshape to indicate a size of the container.
Mnemonic tip: bubbles popping out upwards.
The sign above may be referred to bubbles in general, such as bubbles in bath, fish tank, etc.