suru verb (special), transitive verb, intransitive verb
Transitive and intransitive use for applying heat to something or becoming hot. The intransitive use is less common than the transitive one.
フライパンを熱してから油を入れてください。
Heat the frying pan first, then add oil.
この金属は熱すると
This metal expands when heated.
suru verb (special), intransitive verb
get excited; get worked up; get fired up
Intransitive figurative use for emotions or enthusiasm becoming intense. Often used in contexts like debates, sports, or passionate discussions.
議論が熱して、声が大きくなった。
The discussion got heated and voices grew louder.
彼は試合の前に熱して、集中力が高まった。
He got fired up before the match and his concentration sharpened.