A bundle of hi is an informal expression used to describe a group of people who are very friendly and outgoing. Synonyms for the phrase include a bunch of cheer, a flock of greetings, a swarm of salutations, a gathering of hellos, and a throng of welcomes. These synonyms convey the idea of a group of people who exude positivity and warmth, and who are happy and eager to connect with others. Whether it is at a party, a gathering, or just in passing, encountering a bundle of hi can brighten up anyone's day and leave a lasting, positive impression.