When it comes to keeping someone engaged, it's important to have a variety of synonyms for the phrase "hold the interest." Some phrases that come to mind include capturing attention, maintaining engagement, sustaining attention, securing interest, piquing curiosity, sparking fascination, retaining focus, and fostering concentration. These phrases can be used in a variety of contexts, including writing, public speaking, marketing, and education. By having a range of synonyms available, one can communicate more effectively and keep their audience fully engaged. So next time you want to "hold the interest" of your audience, try switching up your phrasing to keep things fresh and engaging!