열을

heat; anger; column

→ 열
phrase Rare #30,425
heat; anger; column 열을 is 열 followed by the object particle 을. Depending on context, it can refer to heat or a fever, anger (often in expressions like 열을 받다, “get angry”), or a column.
KO: 감기에 걸려서 열을 재 봤어요.
EN: I caught a cold, so I checked my temperature.

왜 열을 내?

Why are you getting so worked up?

— Failan (2001)

물론, 누가 날 죽이려 하면 열을 받지 샤이엔이 열 받으면 하나도 좋을 게 없어

Of course, I’d get mad if someone tried to kill me. Nothing good comes of it when Cheyenne gets mad.

— 옛날 옛적 서부에서 (1968)