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Something, especially a work such as book or film, that evokes such a strong emotional reaction that it literally makes one cry. Sometimes hyphenated as "tear-jerker." The book tells the story of a boy searching for his real family, and it's a tearjerker from start to finish. I don't normally cry at movies, but that ending was a tear-jerker! Her graduation speech was a real tearjerker.
n. a very sad story or film. I don’t care to read a steady diet of tear-jerkers.