Jumping with both feet is an idiomatic expression that means to commit fully or enthusiastically to a decision or action. There are several synonyms which can be used in its place, such as diving in headfirst, taking the plunge, going all in, or throwing caution to the wind. Other phrases that can be used to convey the same idea include seizing the opportunity, embracing the challenge, leaping into action, or throwing oneself into the mix. These expressions all convey the idea of wholeheartedly committing to a situation or decision. While the specific wording may vary, the underlying concept remains the same.