This is the 536th most frequent Vietnamese word.
kêu
"To call," "to cry out," or "to make a sound."
In this sentence, 'kêu' is used to describe the vocal sound made by the cat, like meowing.
Con mèo kêu lên khi thấy con chuột.
The cat meowed when it saw the mouse.
Here, 'kêu' expresses the act of vocalizing pain or distress.
Anh ấy kêu đau sau khi té ngã.
He cried out in pain after falling.
In this context, 'kêu' refers to calling out loudly to attract attention.