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possibly; by some possibility; perhaps
ひょっとしたら雨あめが降るふるかもしれない。
It might possibly rain.
ひょっとしたら彼かれも来るくると思うおもう。
I think perhaps he will come too.
ひょっとしたら道みちを間違えまちがえたのではないか。
Perhaps we took the wrong road.