n (obsolete) A liquid, a fluid.
n (obsolete) A drinkable liquid.
n A liquid obtained by cooking meat or vegetables (or both).
n (UK, cooking) A parsley sauce commonly served with traditional pies and mash.
n (chiefly US, Canada, Australia) Strong alcoholic drink derived from fermentation and distillation; more broadly, any alcoholic drink.
n In process industry, a liquid in which a desired reaction takes place, e.g. pulping liquor is a mixture of chemicals and water which breaks wood into its components, thus facilitating the extraction of cellulose.
n A liquid in which something has been steeped.
v (intransitive) To drink liquor, usually to excess.
v (transitive) To cause someone to drink liquor, usually to excess.
v (obsolete, transitive) To grease.