When expressing support or enthusiasm for something, there are a variety of synonyms for the phrase "are all for." Some alternatives include: fully endorse, strongly advocate, wholeheartedly approve of, staunchly back, firmly support, ardently promote, and emphatically champion. These phrases imply a sense of passion and conviction towards a particular cause, project, or idea. Using synonyms in writing or speaking can help to avoid repetition and add variety to one's language. Whether expressing support for a political candidate, a charitable organization, or a friend's creative endeavor, there are many ways to convey enthusiastic backing.