There are several synonyms that can be used instead of the phrase "set foot". Some common phrases include 'step into', 'enter', 'arrive at', 'arrive in', 'land', 'embark', 'disembark', 'deplane', 'touch down', and 'arrive upon'. These phrases are useful when looking for alternatives to avoid repetition or to add more variety to your writing style. Remember that word choice can greatly impact the tone and mood of your writing, so choose your synonyms carefully to fit the desired effect. Whether you are writing a novel, essay, or article, using synonyms is a great way to improve your writing and keep your readers engaged.