sour note

noun

noun

Idiomatic A negative aspect to something mostly positive.

One sour note was the withdrawal of Rosicky, who suffered concussion after a heavy collision.2011 March 2, Chris Whyatt, “Arsenal 5 - 0 Leyton Orient”, in BBC:
They had a respectful interaction, not a sour note between them, but they never palled around outside of work.2019, Jennifer Keishin Armstrong, Sex and the City and Us, Simon and Schuster, →ISBN, page 94:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.