sour adj.
1 having a sharp taste
VERBS be, taste The sauce tasted very sour.
ADV. extremely, very | a bit, quite, rather, slightly
2 not fresh
VERBS be, smell, taste The milk smelled sour. | go, turn By the next day the wine had turned sour.
ADV. very | a bit, rather, slightly
3 bad-tempered
VERBS be | go, grow, turn | a bit, a little, rather, slightly, somewhat Their friendship has turned a little sour.
ADV. extremely, really, very
You can also check other dicts: sour (English, 中文解释 ), wordnet sense, Collins Definition