“口酸”可以翻译为“sour taste in the mouth” 或者更简洁地表达为 “a sour mouth”(不过“a sour mouth”相对更口语化、非正式一些 ,在描述具体味觉感受的语境中,“sour taste in the mouth” 更常用准确)。
例如:
I've been having a sour taste in my mouth recently.(我最近嘴里一直有股酸味。)
He complained of a sour mouth after eating some unripe fruits.(他吃了些未成熟的水果后,抱怨嘴里发酸 。)