The phrase "breaks seal" refers to the action of opening or unsealing something. There are various antonyms for this word, depending on the context. If we are talking about opening a bottle or a container, the antonym would be "seals" or "closes." However, if we are talking about breaking a secrecy or confidentiality, the antonyms would be "maintains secrecy" or "preserves confidentiality." Similarly, if we are talking about repairing or fixing something, the antonym would be "breaks" or "damages." In conclusion, the antonyms for "breaks seal" will vary depending on the particular meaning and context of the phrase.