This is the 834th most frequent Vietnamese word.
thầy
"Thầy" means "teacher" or "master" in English.
Here, 'Thầy' indicates a male teacher in a formal educational context.
Thầy giáo đang dạy lớp học tiếng Anh.
The teacher is teaching the English class.
In this sentence, 'Thầy' is used as a polite form of address for a male teacher.
Con chào thầy!
Hello teacher!
The word 'Thầy' is used respectably when directly addressing a male teacher, often in an informal tone.