No. 540 in Vietnamese
thay
"Thầy" in Vietnamese means "teacher" or "master" (male).
In a sentence
Tôi thay áo trước khi đi ra ngoài.
I change clothes before going outside.
Here, 'thay' means 'change' or 'replace' something.
Tôi thấy giáo viên hôm nay đầy năng lượng.
I see that the teacher is full of energy today.
In this context, 'thay' refers to 'teacher', used as an abbreviation for 'thầy giáo', meaning a male teacher.
Cô ấy không đi làm hôm nay, tôi phải thay cô ấy.
She is not going to work today, so I have to substitute for her.
Here, 'thay' means 'substitute' or 'stand in for' someone.
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