Expanding up, building up, increasing, and multiplying are some of the antonyms for the term "whittling down." The term whittling down suggests the gradual reduction of something by cutting or carving it away. Expanding up, increasing, or multiplying, on the other hand, implies the increase or enlargement of something. These antonyms are opposites and convey the opposite meaning to whittling down, implying that the substance is increasing or expanding as opposed to being decreased or removed. These terms may be used in various contexts, including economics, science, and politics, among others, to convey the desired connotation.