The term "in surged" can be replaced by a number of different synonyms depending on the context of the sentence. Words like flooded, rushed, and poured in are all appropriate alternatives that can be used to convey a similar meaning. Other synonyms might include surged forward, surged in, or surged ahead, highlighting the sense of fast, sudden motion that is implied by the word. Whether used to describe a crowd or an emotion, the word "surged" carries a sense of energy and intensity that can be conveyed through a variety of different phrasings. Ultimately, the choice of synonym will depend on the specific context and the desired effect of the sentence.