Dictionary

heaven only knows en · X

Meanings

1. (alt-of, alternative) Alternative form of God knows, in sense of something unknown to mortal men.
   alt of God knows
   alt of in sense of something unknown to mortal men
   • 1989, Paul Kennerley for Emmylou Harris's Bluebird, "Heaven Only Knows" I guess that's how it's meant to be, but Heaven only knows.