This is the 6552nd most frequent Japanese word.
チラホラ
"Chirihora" means "scattered" or "here and there," often used to describe things appearing sparsely or intermittently.
In this sentence, チラホラ describes the scattered and irregular movement of the cherry blossom petals as they are carried by the wind.
桜の花びらが風に乗ってチラホラと舞っている。
The cherry blossom petals are fluttering sporadically in the wind.
Here, チラホラ conveys the idea of something appearing sporadically or at scattered locations.
公園には犬がチラホラ見える。
Dogs can be seen here and there in the park.
In this context, チラホラ is used to describe the sporadic and intermittent appearance of memory fragments.