Antonyms for the phrase "break to smithereens" could include phrases such as "unbreakable" or "indestructible," which suggest the opposite of shattering into countless tiny pieces. Other antonyms could include phrases such as "fix" or "repair," as they involve restoring something to its original condition rather than fragmenting it beyond repair. Similarly, "intact" or "whole" could be used as antonyms, suggesting that something remains complete or unbroken. In general, the antonyms of "break to smithereens" imply the opposite of destruction or fragmentation, suggesting instead the preservation and maintenance of something in its original form.