The phrase "close one's chest" can be interpreted in different ways, including physically closing the chest or figuratively shutting down emotions. For the physical interpretation, antonyms could be opening the chest or expanding it. The figurative interpretation could have opposite meanings such as opening up emotionally or expressing oneself. Depending on the context, other antonyms could include being vulnerable, transparent, or honest. It is important to note that the phrase can have various meanings depending on the situation and the language used, so choosing appropriate antonyms requires careful consideration.
