This is the 1959th most frequent Korean word.
땀을
"땀을" means "sweat" (accusative form).
In this sentence, '땀을' is the object of the verb '흘리며', meaning 'sweating' in the context of doing hard work or physical activity.
그는 땀을 흘리며 열심히 운동했다.
He worked out hard, sweating.
Here, '땀을' is used to indicate sweat as a result of an emotional state, serving as the object of the verb phrase '흘렸다', meaning 'sweated'.
긴장해서 땀을 많이 흘렸다.
He sweated a lot due to nervousness.
In this sentence, '땀을' refers to the sweat experienced due to external environmental conditions, linked with the inability to endure it as described with the verb phrase '참을 수 없었다', meaning 'could not endure'.