The phrase "brake open" typically means to force something open by stopping its movement abruptly. Some antonyms for this phrase could include words like "secure shut," "lock tightly," or "close firmly." These words describe actions that would prevent something from being opened or moved, rather than forcibly opening it. Other antonyms for "brake open" might include phrases like "handle with care," "leave intact," or "preserve unopened." These phrases suggest a desire to maintain the existing state of an object, rather than forcefully altering it. Ultimately, the antonyms for "brake open" depend on the context and intended outcome of the action being described.