perhaps; maybe; possibly — an adverb expressing a tentative possibility.
ひょっとすると、彼はもう仕事を辞めているかもしれない。
Perhaps he has already quit his job.
ひょっとすると宝くじに当たるかもしれないよ。
You might possibly win the lottery.
ひょっとすると道に迷ったのではないか。
Maybe they got lost on the way.