Bid hello is often considered a formal or more traditional way of greeting someone. However, there are many other synonyms for this phrase that can be used to convey the same greeting in a more casual or modern way. Some examples of these synonyms could include saying "hey" or "hi," shouting out a simple "hello," or even using a bit of slang by saying "what's up" or "sup." Other alternatives may involve combining the greeting with a physical gesture, such as waving or nodding. Regardless of the chosen synonym, each of these phrases carries the same message of welcoming and acknowledging the presence of another person.