This is the 4487th most frequent Turkish word.
ateşi
"His/her/its fire" or "His/her/its fever" (depending on context).
In this sentence, 'ateşi' means 'his/her/its fever', derived from 'ateş' meaning 'fever' or 'fire', and indicates possession by the third person singular.
Ateşi çok yüksekti, hemen doktora götürdük.
His fever was very high, so we took him to the doctor.
Here, 'ateşi' refers to 'the fire', specifically 'the campfire', using the accusative form of the noun 'ateş' to indicate the object's specificity.
Kamp ateşi etrafında şarkılar söyledik.
We sang songs around the campfire.
In this figurative usage, 'ateşi' refers to 'the fire' metaphorically, implying the controversial or risky aspect of a matter, showing the noun's idiomatic potential.