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sparsely; drop-by-drop
on par with; as good as
(vertical) iteration mark used to represent repetition of the previous kanji (to be read using its kun'yomi)
「点点」 has another reading with different meanings.
雨がちょぼちょぼと降り始めた。
Rain started to fall in sparse drops.
二人の実力は点点で大きな差がない。
The two are about equal in ability with little difference.
ちょぼちょぼとしか生えていない。
It's growing only sparsely.