The phrase 'breaks smithereens' refers to the action of breaking into tiny pieces or fragments. The antonyms for this phrase would include terms such as 'mend,' 'repair,' or 'fix.' These words all refer to actions which involve restoring something to its former shape or condition. Other antonyms might include 'construct' or 'build,' as these words refer to actions which involve creating something anew. Using these antonyms in place of the original phrase would change the overall meaning of a sentence or paragraph, altering the tone or intent of the writing.