The phrase "at all costs" is commonly used to express that something must be done or avoided regardless of the price or effort required. There are several synonyms that can be used in its place, including "by any means necessary", "no matter what", "at any cost", "regardless", and "come hell or high water". These phrases all convey a sense of urgency and determination, emphasizing the importance of achieving a certain outcome or avoiding a specific consequence. When using synonyms for "at all costs", it's important to choose a phrase that accurately reflects your intentions and priorities to avoid any confusion or miscommunication.