1. a sour liquid consisting of dilute and impure acetic acid, obtained by acetous fermentation from wine, cider, beer, ale, or the like: used as a condiment, preservative, etc.
2. Pharmacology. a solution of a medicinal substance in dilute acetic acid, or vinegar.
3. sour or irritable speech, manner, or countenance: a note of vinegar in his voice.
4. Informal. vigor; high spirits; vim.
"lumps can be vinegar."
"loops can be vinegar."
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