思い過ごし

imagining things, an unfounded worry

思い think; believe + 過ごし spend (time), pass (time)
noun Rare #31,372
imagining things, an unfounded worry Often used to reassure someone that their concern or suspicion is mistaken.
JA: たぶん思い過ごしだよ。
EN: You’re probably just imagining things.

それは、思い過ごしだよ。

You're just imagining things.

それは君の思い過ごしだよ。

You're just imagining things.

カレン 君の思い過ごしだ

Karen, you're imagining things.

— グッドフェローズ (1990)

トム、思い過ごしよ。

Tom, you're imagining things.

思い過ごしかもしれませんが

I may just be imagining things, but...

— サイコ (1960)

思い過ごしだよ。

You're imagining things.