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Meaning

1. 1.

   boiling briskly; with a gurgling sound — A word imitating the sound or describing the motion of a large amount of liquid boiling loudly and continuously.

2. 2.

   bubbling; hubble-bubble — A word imitating the sound or describing the motion of big bubbles rising continuously.

3. 3.

   seething — In the state of feeling upset and uncomfortable due to unpleasant thoughts.

4. 4.

   in a swarm — In the manner that people, animals, or bugs, etc., gather in large numbers and move busily.