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Sour
No doubt, anyone can associate with the lemon in this case. Actually, you can describe it as a sinking feeling.
"A sinking feeling is a feeling that something bad is happening or will happen:
He had a sinking feeling that he would not make the team."
(Cambridge University Press 2018, https://dictionary.cambridge.org/dictionary/english/sinking?q=sinking%2Bfeeling)
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