The phrase "in the background" often refers to something that is happening or present but not immediately noticeable or the main focus. There are various synonyms for this phrase that can be used to add variety to writing, such as "behind the scenes," "out of sight," "unobtrusive," "subtle," "low-key," "unnoticed," "incidental," "peripheral," "auxiliary," "secondary," or "supporting." These phrases can be used interchangeably depending on the context of the sentence or the desired tone of the writing. Utilizing synonyms for "in the background" can help to keep writing fresh and engaging, avoid repetition, and add depth to the message.