1
general::
Phrase(s): *sour as vinegar
1. [of something] very sour. (*Also: as ~.) • This milk is as sour as vinegar. • The juice they gave us is sour as vinegar. 2. [of someone] ill-natured and disagreeable. (Fig. on Q. *Also: as ~.) • The old man greeted us ill-naturedly, his face as sour as vinegar. • Jill: Is Mary in a bad mood today? Jane: Yes, sour as vinegar.
McGrawhill's American Idioms And Phrasal Verbs