The phrase "did in to" can have different meanings depending on the context, such as investigating deeply or attacking vigorously. There are various synonyms for this phrase that can be used to add nuance or variety to language. For example, synonyms for "did in to" when indicating deep investigation could be scrutinized, delved, or probed. When indicating vigorous attack, synonyms such as assailed, assaulted, or pounced could be used. Overall, using a range of synonyms can help to make writing more interesting and engaging, while also conveying the intended meaning more clearly.