When it comes to the phrase "one's all", there are many synonyms that can be used to convey a similar meaning. Some of these synonyms include "giving it everything", "putting it all on the line", "going all out", "exerting oneself", "doing one's utmost", "leaving it all on the table", "going for broke", and "pouring one's heart and soul into something". All of these phrases imply a sense of dedication and sacrifice, indicating that the person is willing to give up everything in order to achieve their goal. While there may be slight nuances between each of these synonyms, they all ultimately communicate a similar idea - that someone is putting their everything into something.