Definition
Following very closely behind someone, often in pursuit or immediately after.
緊跟在後面
The athlete crossed the finish line with other competitors hot on his heels.
這位運動員衝過終點線時，其他選手緊追在後。
The police were hard on the heels of the thief as he made his escape.
警察緊追在後，小偷拼命逃跑。
After the new product launched, competitors were close on its heels, trying to catch up.
新產品推出後，競爭對手緊追不捨，試圖趕上。