INDIAN SUMMER

period of unusually warm weather in the late autumn or early winter (in North America)

Indian summer is a name given to a period of sunny, warm weather in autumn, not long before winter. Usually occurring after the first frost, Indian summer can be in late October or early November in the northern hemisphere, and late April or early May in the Southern hemisphere. It can persist for a few days or extend to a week or more.
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Noun
1. a period of unusually warm weather in the autumn
(synonym) Saint Martin's summer
(hypernym) time period, period of time, period
(part-holonym) fall, autumn

indian summer /'indjən'sʌmə/
danh từ thu muộn những năm cuối cùng nhàn tản của cuộc đời
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n. ช่วงเวลาสงบและมีความสุขก่อนถึงจุดสิ้นสุดของสิ่งใดสิ่งหนึ่ง; ช่วงอากาศอบอุ่นตอนปลายฤดูใบไม้ร่วงหรือตอนต้นฤดูหนาว