hit a sour note
To indicate, introduce, or allude to something particularly unfortunate, unpleasant, or disagreeable. News of my father's passing hit quite a sour note before my graduation ceremony. No one in the family brought attention to David's drinking problem until it started hitting a sour note at their holiday get-togethers. We weren't having a good season, no, but it really hit a sour note when our beloved coach got fired.
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