The Vietnamese word "gay gắt" is an adjective that describes something that is intense, severe, or sharply critical. It can refer to situations, comments, or emotions that are very strong or extreme.
In a debate: "Cuộc tranh luận giữa hai chính trị gia đã trở nên gay gắt."
(The debate between the two politicians became heated.)
In a weather context: "Thời tiết hôm nay thật gay gắt."
(The weather today is blazing hot.)