This is the 14268th most frequent Russian word.
острое
"Острое" means "spicy" or "sharp" (as in taste or sensation).
The word 'острое' is used to describe 'зрение' (eyesight), emphasizing its acuity or keenness.
У него острое зрение.
He has sharp eyesight.
The word 'острое' refers to food spiciness here, used substantively to represent spicy food.
Я не могу есть острое.
I can't eat spicy food.
Here 'острое' describes the nature of the discussion, indicating its intensity or focus.