Intermittently; little by little; speaking or happening in scattered, sporadic bits.
彼はポツリポツリと自分の過去を話し始めた。
He began to talk about his past in a sporadic, halting way.
店がポツリポツリと増えてきた。
Shops have been appearing little by little.
会場ではポツリポツリと拍手が起こった。
There were sporadic bursts of applause in the venue.
Describes small drops falling intermittently (e.g., rain falling in spots).
空を見るとポツリポツリと雨が降り始めていた。
Looking at the sky, light spots of rain had begun to fall.
傘はいらないかなと思ったら、ポツリポツリと本格的に降ってきた。
I thought I might not need an umbrella, but then it started raining in little drops.