soured
v.
（使某物）变酸，变馊， （使某人）阴郁( sour的过去式和过去分词 );
关系、态度、人等（使）变坏，恶化;
例句:
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Thin down your mayonnaise with soured cream or natural yoghurt.
用酸奶油或原味酸奶稀释蛋黄酱。
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Her mood soured a little.
她的心情有点差。
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The harsh rhetoric had so soured officials that the two sides were barely speaking.
激烈的言辞让官员们关系如此恶化，双方几乎不怎么说话。
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When Dick left the Air Force the marriage soured.
来自New Yorker
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The sessions soured even some friends of the industry.
来自WSJ
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Serve with soured cream, tortillas and guacamole.
来自BBC