The crossword solutions for the term STRENGTHENS, WITH 'UP' are TONES, BEEFS, and GOOSES. Tones is a term used to describe the quality of sound, usually referring to the pitch or frequency. Beefs is a slang term for complaints or grievances. GOOSES is a plural form of the word goose, which is a type of waterfowl. All three terms can be used in the context of strengthening something, with 'UP' being the emphasis.