The term 'LIVENS (UP)' is made up of six crossword solutions: SPICES (6 letters), PEPS (4 letters), REVS (4 letters), INVIGORATES (11 letters), AMPS (4 letters), and PERKS (5 letters). SPICES are ingredients used to add flavor and aroma to food, while 'peps' is a slang term for energy or enthusiasm. 'REVS' is short for revolutions, which can refer to the speed of an engine or the rotation of a wheel. 'INVIGORATES' means to give strength or energy to, while 'amps' is a unit of electrical current. Finally, 'PERKS' are benefits or privileges given to employees. Together, these words describe the act of livening up, or adding energy and enthusiasm to something.