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To become unpleasant or troubling. Those two are bickering all the time now—I hope their relationship hasn't gone sour. Don’t bring up politics unless you want things to go sour real fast!
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
Fig. to turn bad or unpleasant. It looks like all my plans are going sour. My whole life is going sour right now.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
go/turn ˈsourbecome less enjoyable, pleasant or good: Relations between the two nations have recently gone sour.
Farlex Partner Idioms Dictionary © Farlex 2017
in. to turn bad or unpleasant. My whole life is going sour right now.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.