沸く

1. Origins, structure, and basic meaning

• Structure: Written 沸く and read わく, it means for a liquid to boil or for a crowd to erupt in excitement.
• Basic usage: It applies to water reaching a boil and a venue reacting to a dramatic comeback.

2. Common pitfalls and similar expressions

• Two intransitive senses
  • The subject reveals whether the change is physical boiling or collective excitement.