English edit

Etymology edit

By metaphor, from the notion that glass is fragile (easily broken).

Pronunciation edit

Noun edit

heart of glass (plural hearts of glass)

  1. (idiomatic, figurative) A heart (or by extension, person) in a very fragile romantic state: one that is easily made broken-hearted.
    • 1978, Debbie Harry & Chris Stein, "Heart of Glass", Blondie, Parallel Lines.
      Once I had a love and it was a gas / Soon turned out, had a heart of glass

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