Tossing in is a term often used to describe a sudden addition or inclusion of something in a conversation or situation. If you are looking for synonyms for the phrase tossing in, some good options include introducing, adding, injecting, including, incorporating, infusing, interjecting, and throwing in. Each of these words conveys a sense of bringing something new into a situation, with a focus on the suddenness or surprise of the addition. Whether you are looking to expand your vocabulary or simply find a more descriptive way to express yourself, these synonyms for tossing in are a great place to start.