The phrase "breaking seal" implies a sense of opening, revealing or unraveling, which can suggest various antonyms depending on the context. In terms of breaking a seal on a letter or a package, the antonym might be "sealing" or "closing". In the case of a broken seal on a container or bottle, the opposite could be "intact" or "sealed". When it comes to breaking a personal bond or commitment, the antonym could be "keeping" or "honoring". Whatever the scenario or usage, identifying effective antonyms for the phrase "breaking seal" can help to convey the intended message and create a clear understanding.