expression
there it is; I knew it; of course
Exclamation used when something expected or predicted happens, often with a tone of 'just as I thought' or 'see, I told you so'. Casual and conversational.
あ、それ来た!やっぱり雨が降ってきた。
Ah, there it is! Just as I thought, it started raining.
彼が遅刻すると思ったら、それ来た。
I thought he'd be late, and sure enough, there he is.