The phrase "put zip into" refers to adding energy, enthusiasm, or vigor to something. Antonyms, or words with opposite meanings, that could be used instead of "put zip into" include "calm down," "de-energize," "demotivate," "dull," "sap," and "weaken." These words describe actions or outcomes that reduce energy and passion. Using antonyms of "put zip into" could suggest a lack of excitement or enthusiasm, perhaps indicating a need for change or renewal. It's always important to use the right words to express the intended meaning, recognizing the power that language has to influence thoughts and attitudes.