This is the 639th most frequent Vietnamese word.
sôi
"Boiling" or "to boil."
Here, the word 'sôi' is used as a verb to describe the action of boiling.
Nước trên bếp đang sôi.
The water on the stove is boiling.
In this context, 'sôi' is used metaphorically to describe an intense emotional state.
Anh ấy cảm thấy lòng mình sôi lên vì giận dữ.
He felt his heart boiling with anger.
In this case, 'sôi' is part of the compound 'sôi động', meaning 'lively', reflecting an energetic mood.