The phrase "at desire" is often used to describe something that can be obtained if one wants it badly enough. There are several synonyms that can be used in place of this phrase, such as "upon request", "at one's discretion", "as one wishes", or "at will". These phrases convey a similar meaning to "at desire", indicating that something is available to someone if they choose to ask for it or use their own judgement to obtain it. Additionally, words like "optional", "elective", or "flexible" can also be used to describe something that is available if desired, without necessarily implying a requirement or obligation to obtain it.