YOU SAID:

heard it on the grapevine

INTO JAPANESE

ブドウにそれを聞いた

BACK INTO ENGLISH

I heard it in grapes

INTO JAPANESE

私はブドウでそれを聞いた

BACK INTO ENGLISH

I heard it at grapes

INTO JAPANESE

私はブドウでそれを聞いた

BACK INTO ENGLISH

I heard it at grapes